P0B38
Motor Electronics Coolant Pump B Control Circuit/Open
P0B38 is an OBD-II diagnostic trouble code meaning: Motor Electronics Coolant Pump B Control Circuit/Open. Common causes: broken or damaged control circuit wiring, pump motor malfunction. Estimated repair cost: $167–444.
Symptoms
- Electronics overheat warning on instrument panel
- Reduced engine power (in hybrid systems)
- Activation of emergency operation
- Noise or hum from the cooling pump
- Overheating of electronic components
Causes
- Broken or damaged control circuit wiring
- Pump motor malfunction
- Problems with the pump circuit relay or fuse
- Corrosion of contacts in connectors
- Mechanical failure of the pump (jamming)
How to Fix
- Check the pump circuit fuses and relays
- Testing the resistance of pump motor windings
- Check the integrity of wiring and connectors
- Diagnostics of control signals from the computer
- Replacing a faulty cooling pump
Related codes
Error P0B38 by Vehicle Brand
FAQ
What does the P0B38 code mean?
P0B38 is an OBD-II diagnostic trouble code that indicates: Motor Electronics Coolant Pump B Control Circuit/Open
What causes a P0B38 error code?
The most common causes of P0B38 include: Broken or damaged control circuit wiring; Pump motor malfunction; Problems with the pump circuit relay or fuse; Corrosion of contacts in connectors.
How do I fix a P0B38 diagnostic trouble code?
To fix P0B38: Check the pump circuit fuses and relays. Testing the resistance of pump motor windings. Check the integrity of wiring and connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0B38?
Do not drive — repair immediately
How much does it cost to fix P0B38?
The estimated repair cost for P0B38 is $167–444. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat