Error code
OBD2 P0977
OBD2P0977
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Shift Solenoid 'B' Control Circuit High.
Severity
moderateCan drive but may experience shifting issues.
Summary
P0977 indicates that Shift Solenoid B in your transmission has an electrical issue causing high resistance or an open circuit.
Symptoms
- Poor acceleration
- High-revving before shifting
- Harsh shifting
Common Causes
- Rodent damage to wiring harness
- Poorly routed or damaged wiring harness after repairs
- Burnt out shift solenoid B
Diagnosis
- Inspect wiring harness for damage or poor connections
- Perform resistance checks between TCM and solenoid B
- Check continuity in the harness and test solenoid B
Fixes
- Repair damaged wiring harness or replace faulty shift solenoid
FAQ
What should I do if P0977 appears?
Inspect the wiring harness and perform resistance checks to identify any damage or open circuits. If issues are found, repair them or replace the faulty shift solenoid.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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