OBD-II code · Powertrain (generic)
P023B Charge Air Cooler Coolant Pump A Control Circuit Low
CAC coolant pump A control voltage below expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P023B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyWiring shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Cac Coolant Pump A, Pump Wiring
Related codes
- P2CAECharge Air Cooler Coolant Pump B Control Circuit Low
- P0238Turbocharger/Supercharger Boost Sensor "A" Circuit High
- P0239Turbocharger/Supercharger Boost Sensor B Circuit
- P023ACharge Air Cooler Coolant Pump A Control Circuit/Open
- P023CCharge Air Cooler Coolant Pump A Control Circuit High
- P023DManifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor A Correlation
- P023EManifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor B Correlation
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.