B1390
Control Module Supply Circuit 1
B1390 is an OBD-II diagnostic trouble code meaning: Control Module Supply Circuit 1. Common causes: poor contact in the power circuit, broken or damaged wires. Estimated repair cost: $33–167.
Symptoms
- Unstable engine operation
- Power dips
- Check Engine Light Is On
- Malfunctions of the car's electronic systems
Causes
- Poor contact in the power circuit
- Broken or damaged wires
- Faulty relay or fuse
- Battery or alternator problems
- Malfunction of the control module itself
How to Fix
- Check fuses and relays associated with the control module
- Inspect the wiring harness for damage
- Check the contacts in the control module connectors
- Test the voltage in the power circuit
- If necessary, replace the control module
Related codes
FAQ
What does the B1390 code mean?
B1390 is an OBD-II diagnostic trouble code that indicates: Control Module Supply Circuit 1
What causes a B1390 error code?
The most common causes of B1390 include: Poor contact in the power circuit; Broken or damaged wires; Faulty relay or fuse; Battery or alternator problems.
How do I fix a B1390 diagnostic trouble code?
To fix B1390: Check fuses and relays associated with the control module. Inspect the wiring harness for damage. Check the contacts in the control module connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1390?
Limited driving only, diagnose soon
How much does it cost to fix B1390?
The estimated repair cost for B1390 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat