What Does P0970 Mean?
The TCM has detected that the Pressure Control Solenoid C (PCS-C) circuit voltage is consistently below the expected level, indicating a short to ground. The solenoid's control circuit is being pulled low, preventing the TCM from properly modulating solenoid current. This typically results in the transmission defaulting to maximum line pressure in the affected circuit, causing harsh shifts or abnormal torque converter clutch behavior.
Safety Warning
Harsh shifts from uncontrolled pressure can damage internal components. The transmission may enter limp mode. Continued driving with a shorted solenoid circuit accelerates wear. Diagnose and repair promptly to avoid costly internal transmission damage.
Common Causes
35%
Short to ground in the PCS-C internal transmission wiring harness
30%
PCS-C solenoid coil internally shorted, reducing resistance below specification
20%
Corroded or shorted terminals at the transmission case connector on PCS-C pins
10%
External wiring harness short to ground between TCM and transmission
5%
TCM internal driver circuit shorted low
Diagnostic Steps
1
Disconnect the transmission case connector and measure PCS-C solenoid resistance — a reading significantly below the 4-8 ohm specification indicates an internally shorted solenoid coil.
2
With the connector disconnected, measure insulation resistance from each PCS-C circuit wire to the transmission case — should be greater than 10K ohms. Low readings indicate a ground fault in the internal harness.
3
Inspect the transmission case connector for fluid contamination, corrosion, heat damage, or evidence of pin-to-case contact. Clean and dry the connector thoroughly.
4
Check the external wiring harness from TCM to transmission for chafed insulation, pinched wires, or contact with metal edges or heat sources.
5
If all external tests pass, measure voltage at the TCM PCS-C output pins to determine if the low condition originates within the TCM itself.
Estimated Repair Cost
$200 - $1,400
Parts + labor, varies by vehicle and location
The TCM has detected that the Pressure Control Solenoid C (PCS-C) circuit voltage is consistently below the expected level, indicating a short to ground. The solenoid's control circuit is being pulled low, preventing the TCM from properly modulating solenoid current. This typically results in the tr...
The most common cause of P0970 (Pressure Control Solenoid "C" Control Circuit Low) is: Short to ground in the PCS-C internal transmission wiring harness
Typical repair costs for P0970 range from $200 to $1,400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Harsh shifts from uncontrolled pressure can damage internal components. The transmission may enter limp mode. Continued driving with a shorted solenoid circuit accelerates wear. Diagnose and repair promptly to avoid costly internal transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0970 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission / Transaxle
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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