P2C49Coolant Pump D Control Circuit Performance/Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2C49 is the functional check of coolant pump D: the command arrives and the control line is intact, but the pump does not run or does not reach the effect the module expects. No manufacturer publicly documents P2C49. GM shows the method on pump C with P2C48: its diesel tables derive an expected phase current from the measured pump speed and set a type B fault once the difference persists for about 5 seconds. Ford's 2024 gasoline summary carries the same fault type for its auxiliary pumps A and B (P2601, P261B), monitored continuously above 11 V. Which loop pump D serves depends on the vehicle, often a second low-temperature or component circuit. Causes include a seized impeller, air, a weak motor or wiring resistance. The circuit it cools then runs hotter.
- What you may notice
- Check engine light
- Higher temperature in the circuit served by pump D
- Possible power reduction to protect components
- Likely causes
- LikelyAir in the loop or low coolant after a leak or repair
- PossibleSeized or worn pump D
- PossibleHigh resistance in supply, ground or control wiring
- RareControl module software judging the pump wrongly
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.