Pressure Control Solenoid "C" Control Circuit Low
P0970 indicates the transmission pressure control solenoid C circuit is detecting a low voltage or open circuit condition. The PCM has identified an electrical fault in the solenoid control circuit that prevents proper pressure regulation in the automatic transmission.
What You Might Notice
- Check Engine Light illuminated
- Transmission slips or hesitates when shifting
- Hard or harsh transmission shifts
- Increased fuel consumption
- Transmission may enter limp mode with limited gear selection
Most Common Causes
- 1
Faulty pressure control solenoid C
The solenoid itself has failed or developed an internal electrical fault, preventing proper current flow through the circuit.
- 2
Wiring damage or corrosion
The wiring harness connected to solenoid C is broken, pinched, corroded, or has loose connections causing an open circuit or high resistance.
- 3
Transmission control module (TCM) fault
The TCM or PCM is unable to properly command the solenoid due to an internal module malfunction or programming issue.
- 4
Low transmission fluid level
Insufficient transmission fluid can cause erratic solenoid operation and electrical signal anomalies if fluid level is critically low.
How to Diagnose It
- 1
Check Faulty pressure control solenoid C — The solenoid itself has failed or developed an internal electrical fault, preventing proper current flow through the circuit.
- 2
Check Wiring damage or corrosion — The wiring harness connected to solenoid C is broken, pinched, corroded, or has loose connections causing an open circuit or high resistance.
- 3
Check Transmission control module (TCM) fault — The TCM or PCM is unable to properly command the solenoid due to an internal module malfunction or programming issue.
- 4
Check Low transmission fluid level — Insufficient transmission fluid can cause erratic solenoid operation and electrical signal anomalies if fluid level is critically low.
How to Fix It
- 1
Replace pressure control solenoid C
Remove and replace the faulty solenoid with an OEM or quality aftermarket replacement, then clear the fault code and test drive.
- 2
Inspect and repair wiring harness
Visually inspect the solenoid connector and wiring for corrosion, damage, or loose connections. Repair or replace damaged wiring and ensure all connectors are clean and seated properly.
- 3
Check transmission fluid level
Verify the transmission fluid is at the correct level using the dipstick or sight glass. Top off with the correct fluid type if needed and recheck operation.
- 4
Reprogram or replace TCM/PCM
If wiring and solenoid are confirmed good, have the transmission control module reprogrammed or replaced by a qualified technician using diagnostic equipment.
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