Powertrain, generic (extended)

P2C49 Coolant Pump D Control Circuit Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Air in the loop or low coolant after a leak or repair
Seized or worn pump D
High resistance in supply, ground or control wiring
Control module software judging the pump wrongly

Symptoms

  • Check engine light
  • Higher temperature in the circuit served by pump D
  • Possible power reduction to protect components

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

coolant pump dwiring harnessecm

Related codes

P2B66P2B6AP2B6CP2BA1P2C48P261B

References: law.cornell.edu, gsi.ext.gm.com, fordservicecontent.com.