P25A2 — standardised OBD-II powertrain code

P25A2 is a standardised (ISO/SAE) powertrain code, so it means the same thing on any vehicle — but we have not yet written a plain-English definition for this one. Below are the vehicles and failure patterns where owners report it, drawn from NHTSA complaints.

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In our record, P25A2 is reported most often on GMC and Chevrolet vehicles , against brakes and electrical failure patterns , across 2019–2024 model years. GMC alone accounts for 63% of them.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite P25A2 across 8 vehicle failure patterns. Diagnostic codes in complaints are reported by owners and are unverified — they point to where this code shows up, not a confirmed diagnosis. Open a page below for the full pattern (symptoms, mileage, repair costs owners cite).

Vehicles where owners report P25A2 8 patterns

2024 Chevrolet Colorado

brakes — Brake master cylinder internal failure with eBoost power assist loss

2022 GMC Sierra

powertrain — Diesel Engine Failures (3.0L Turbo-Diesel)

2022 GMC Sierra

electrical — Antilock braking system warning and diagnostics alerts

2020 Chevrolet Silverado

brakes — Complete brake system failure / loss of braking power

2020 Chevrolet Silverado

electrical — Transmission Control Module (TCM) / Powertrain Loss of Communication

2019 GMC Sierra

brakes — Complete or severe loss of brake power (pedal to floor, 5-10% braking capacity)

2019 GMC Sierra

powertrain — 8-speed transmission hard shifting, shuddering, and downshifting

2019 GMC Sierra

electrical — Brake system failure and loss of braking power

Codes are pulled from what owners wrote in their NHTSA filings — they're allegations, not a shop diagnosis. Always confirm with a live scan. Browse all diagnostic codes →