This Preliminary Information communication advises the technician that if OnStar is unable to configure the vehicle after the OnStar 15-08-44-001 upgrade and Onstar receives a 118 error code when attempting to configure the vehicle. Dealers should receive a sheet with the kit that provides steps to assist with handling this error. Dealer will follow one of the listed steps to resolve the issue. If there are still configuration issues, please contact the OnStar Technical Assistance Centre for assistance.
full bulletin at NHTSA ↗2005 Chevrolet Avalanche electrical problems
moderate 68 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Failure mileage
Complaints
68
Recalls
0
Avg fix
$850
3fires
When does it fail?
Of the 68 electrical complaints filed for the 2005 Chevrolet Avalanche, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Of the 8 model years of Chevrolet Avalanche we track for electrical problems, this one carries the most owner complaints on file — 68.
Electrical accounts for 33% of every owner complaint on file for this vehicle — the dominant problem area across 12 categories tracked.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This technical bulletin provides repair information for repairing the IP to body harness connector to correct a customer concern for intermittent Malfunction Indicator Lamp (MIL) illuminated with Reduced Engine Power displayed and DTC P2138 set.
full bulletin at NHTSA ↗This Preliminary Information communication provides information to the technician about vehicle that may have an OnStar system that has progression tones when pressing the blue or red button. Technician will need to call General Motors Technical Assistance Center with the scan tool data from the OnStar system.
full bulletin at NHTSA ↗This Preliminary Information communication provides information to the technician about vehicles that the speedometer needle appears to be inaccurate. Dealer should advise the customer the specification for speedometer needle accuracy is +/- 2 MPH at any given speed when looking straight at the needle.
full bulletin at NHTSA ↗This Preliminary Information communication provides information to the technician about customers that are unable to override the automatic door locking feature. Technician will update the Body Control Module on 2006 to 2007 model years. On 2010 to 2014 model years technician will need to contact Techline Customer Support for calibrations.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2005 Chevrolet Avalanche has a widespread instrument cluster failure pattern centered on the speedometer stepper motor. Owners report the needle reading wildly inaccurate speeds—120+ MPH while parked or traveling at 25–35 MPH, then sticking at those false readings. Some report the gauge refuses to reset to zero when stopped. The failure typically occurs between 40,000 and 85,000 miles, though cases start appearing as early as 19,000 miles. Dealerships quote $500–$600 for cluster replacement, and a handful of owners report multiple replacements within weeks without permanent fix.
Related cluster gauges fail similarly: tachometer, fuel, oil pressure, and water temperature gauges get pinned at minimum or maximum. One owner's instrument panel backlights failed four times consecutively at $600 per replacement.
A separate and critical issue involves the HVAC blower motor resistor short-circuiting and igniting inside the dashboard. One owner observed fire originating behind the glove box while attempting to increase fan speed. GM issued a service bulletin for this fire hazard, but only in Canada—not the U.S.
Owners also report intermittent electrical faults: StabiliTrak disabling itself while driving, cruise control dropping out, headlights flickering during braking, and doors locking selectively—all tied to module communication loss (diagnostic code P1626). One dealership suggested a known battery cable defect but could not reproduce or fix the problem.
GM extended warranty coverage for this cluster defect on 2002–2004 models but excluded 2005 vehicles from recalls despite identical components.
Same Chevrolet Avalanche electrical reports on nearby years: 2007 · 2008
Failure modes owners describe
Instrument Cluster Stepper Motor Failure—Speedometer
The speedometer needle becomes erratic, gets stuck at incorrect speeds, or stops functioning entirely. Owners report readings of 120+ MPH while stationary or traveling at much lower speeds. The needle sometimes fails to reset to zero when stopped. In many cases, turning the engine off and restarting temporarily resets the gauge.
When: Between 19,000 and 120,000 miles; most commonly reported in the 40,000–75,000 mile range.
Symptoms owners cite: Speedometer reads wildly inaccurate speeds (e.g., 120+ MPH in parking or at low speed); Needle stuck at single speed regardless of actual vehicle speed; Gauge fails to return to zero when vehicle is stopped; Intermittent erratic needle movement before total failure; Temporary reset after engine shutdown and restart
Repairs/costs cited: Dealership quotes $500–$600 for instrument cluster replacement. Some owners report multiple cluster replacements in short intervals without permanent fix.
Recalls/TSBs owners mention: GM issued warranty coverage for 2002–2004 models with similar stepper motor defects but excluded 2005 models from recalls despite identical components and failure patterns. Service bulletins exist but owners report limited dealer cooperation. GM declined to repair out-of-warranty vehicles.
Additional Instrument Cluster Gauge Failures
Beyond the speedometer, other gauges in the cluster (tachometer, fuel gauge, oil pressure, water temperature, transmission shift indicator) exhibit similar stepper motor failures, often developing independently or shortly after the speedometer fails.
When: Concurrent with or following speedometer failure, typically 40,000–85,000 miles.
Symptoms owners cite: Tachometer stuck or non-functional; Fuel gauge stops working; Oil pressure gauge pinned at min or max; Water temperature gauge pinned at min or max; Shift lever position indicator does not illuminate
Repairs/costs cited: Requires full instrument cluster replacement ($500–$600); individual gauge repair not typically offered.
Recalls/TSBs owners mention: No specific recall or warranty extension for 2005 models despite identical design to covered earlier years.
Instrument Panel Lights Failure
Instrument panel backlighting intermittently or permanently fails, rendering gauges unreadable at night. One owner reported four consecutive instrument panel replacements before issue was resolved.
When: Between 19,000 and 51,000 miles.
Symptoms owners cite: Instrument panel lights go out suddenly (often with audible 'click'); Gauges become unreadable at night; Lights remain off or flicker
Repairs/costs cited: Instrument panel replacement at $600 per unit plus installation; repeated failures observed in some vehicles.
Recalls/TSBs owners mention: No recall identified; dealership repairs at owner expense.
HVAC Blower Motor Resistor Fire
The HVAC blower motor resistor and connector short-circuit and ignite inside the right side of the dashboard. Fire originates near the blower motor and resistor components behind and slightly below the glove box.
When: One incident reported during normal HVAC operation.
Symptoms owners cite: HVAC blower fan will not increase speed and remains stuck on low; Smoke visible inside right side of dashboard; Fire observed originating from blower motor/resistor area; Blower continues running even after engine shutdown
Repairs/costs cited: Fire suppression and component replacement required.
Recalls/TSBs owners mention: GM issued Service Bulletin Special Coverage Adjustment Bulletin No. 11046 for blower motor resistor short-circuit fire hazard, but this bulletin was limited to Canada and not applied in the United States. One owner reported receiving a recall letter in September 2011 regarding the blower motor resistor fire hazard.
Electrical System Communication/Voltage Drop Events
Loss of communication between vehicle control modules results in cascading electrical faults including erratic lighting, accessory behavior, and system resets. One 2007 Avalanche owner (included in narrative as comparative evidence of pattern) documented extensive intermittent failures suggesting broader electrical harness or power distribution issues.
When: Intermittent; can occur while driving or while parked.
Symptoms owners cite: StabiliTrak disabled without driver input; traction control off warning; Theft deterrent warning lights illuminate; Flickering headlights when brakes applied; Cruise control disengages at speed; HVAC unit goes off and resets; NAV/radio goes off with loud 'pop'; Door control panel flashing with headlights; Driver's seat moves forward during remote unlock; Reverse mirror tilt activates unexpectedly; Door locking malfunction (selective door locking); Engine hour meter resets to zero
Codes mentioned: P1626 (Loss of communication with modules)
Repairs/costs cited: Dealership suggested known issue with OEM battery cables; battery cable tested okay in one case. No repair completed; underlying cause not definitively identified by dealership.
Recalls/TSBs owners mention: Dealership acknowledged known battery cable issue but unable to reproduce intermittent failures or provide definitive remedy.
Blower Motor Control Relay Short-Circuit
The fan motor control relay and connector short-circuit, typically located behind and slightly below the glove box. This failure can lead to overheating and fire risk.
When: Not specified.
Symptoms owners cite: Blower motor control malfunction; Short-circuit in relay and connector; Potential fire hazard
Repairs/costs cited: Relay and connector replacement required.
Recalls/TSBs owners mention: GM issued Service Bulletin Special Coverage Adjustment Bulletin No. 11046, but coverage was limited to Canada and not extended to the United States.
Synthesized from 68 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 9 most recent
Speedometer cluster broken on 2005 Chevy avalanche. At 52,000 miles Chevy has a known problem with faulty speedometers. Please see below website to get a feel of how many people are having the same problem ... Http://www.topix.com/forum/autos/Chevrolet-tahoe/t2bgkbgi55eknu77c. *tr
The shift lever position indicator does not illuminate. The odometer does not show current speed ( miles per hour .) the ABS sensor doesn't work.
2005 Chevrolet avalanche at approx. 40,000 miles the speedometer has gone crazy never giving the correct speed. Several others with this problem and recall has been call for 2002 -2004 models that use the same cluster and step motor that controls the speedometer. Contacted the dealer to fix problem but they wanted 600+ to fix the problem. *tr
The fan motor control relay and connector short circuited and burned up. The location of this relay is behind and slightly below the glove box. General motors issued a service bulletin special coverage adjustment bulletin no 11046 for this problem, however it was only valid in canada, not the united states.
I have a 2005 Chevy avalanche that I am the original owner and have recently had a problem with the speedometer not working correctly. Some days it works fine and other days it doesn't work or the speed is all over the place. I have heard this has been an issue on previous year models and gm has not done a recall. No one can tell me exactly what the problem is and I don't want to waste money…
After starting the truck and turning on the ac the driver side was pushing hot air while the passenger side was cool. This problem has occurred several times over the past few months the only way to clear the error was to restart the truck. I have not brought the issue to the dealer as it happens so in frequently. *tr
I own a 2005 Chevrolet avalanche and the speedometer stopped working. The truck has 51k miles and not been modified. This is a danger to my family and the cost of repair is expensive. This is a know issue and should be a recall. *tr
2005 avalanche speedometer started reading slower than I was traveling one month later it doesn't work. *tr
Speedometer acts erratically, will often stay at zero, sometimes will start at 30 and progress @ 30 MPH above the right speed. After contacting dealership was told I would have to buy a new speedometer. This is a well documented problem and should be considered a recall. *tr
Had electrical trouble with your 2005 Chevrolet Avalanche?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2005 Chevrolet Avalanche?
It's a documented issue but not catastrophic. 68 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
At what mileage does the electrical typically fail?
Across the 55 complaints that reported odometer mileage, most electrical failures cluster between 51,000 and 82,800 miles, with the median around 60,000. A quarter of owners report trouble before 51,000; a quarter make it past 82,800. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2005/Chevrolet/Avalanche.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.