Engine Coolant Circulation Pump Circuit
Table of contents
B3844 GMC Possible Causes
- Faulty Auxiliary Water Pump Relay
- Auxiliary Water Pump Relay harness is open or shorted
- Auxiliary Water Pump Relay circuit poor electrical connection
- Faulty Hybrid Control Module (HCM)
How do I fix code B3844 GMC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B3844 GMC code
The cost of diagnosing the B3844 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B3844 GMC Description
The Hybrid Control Module (HCM) controls the coolant pump operation by applying voltage to the coolant pump relay control circuit with an internal solid state device called a driver. When the HCM is commanding the relay ON, the voltage of the control circuit should be high, near 12 volts. When the HCM is commanding the relay OFF, the voltage potential of the control circuit should be low, near 0 volts. The Diagnostic Trouble Code (DTC) sets when the HCM determines the state of the coolant pump relay control circuit is shorted to ground, open or shorted to power.