C0020 — ABS pump motor circuit — anti-lock brake system fault

Code C0020 is a standard OBD-II diagnostic trouble code: ABS pump motor circuit — anti-lock brake system fault.

In our record, C0020 is reported most often on RAM and Mazda vehicles , against brakes and cruise control failure patterns , across 2010–2018 model years. RAM alone accounts for 89% of them.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite C0020 across 9 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 C0020 9 patterns

2018 RAM 2500

brakes — ABS Hydraulic Control Unit (HCU) Failure

2018 RAM 3500

brakes — Hydraulic Control Unit (HCU) failure

2017 RAM 3500

brakes — Hydraulic Control Unit (HCU) failure

2017 RAM 2500

cruise control — ABS/HCU Module Failure

2016 RAM 2500

brakes — ABS control module electrical failure

2015 RAM 1500

brakes — ABS Module Failure (Part 68228991AD)

2015 RAM 3500

brakes — ABS module and HCU failure

2014 RAM 1500

electrical — ABS/HCU module failure causing cascading electrical faults

2010 Mazda Mazda3

brakes — ABS Pump Motor and Control Module Failure

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 →