Fix P0971: STEP-BY-STEP diagnostic GUIDE!

The P0971: Pressure Control Solenoid ‘C’ Control Circuit High refers to an issue where the pressure control solenoid ‘C’ circuit is experiencing higher than expected voltage. This can lead to improper operation of the solenoid, causing transmission fluid pressure regulation problems and poor shifting performance.

P0971 – Quick Overview

CodeInformation
MeaningP0971: Pressure Control Solenoid ‘C’ Control Circuit High
Is it serious?Yes, as high voltage can cause solenoid malfunction, affecting transmission pressure control.
Possible causes– High voltage in the pressure control solenoid ‘C’ circuit
– Faulty pressure control solenoid ‘C’
– Wiring or connector issues
How to diagnose?– Check the circuit for high voltage
– Inspect wiring and connectors
– Replace the pressure control solenoid ‘C’ if necessary

P0971 Meaning

The P0971: Pressure Control Solenoid ‘C’ Control Circuit High code indicates that the voltage in the pressure control solenoid ‘C’ circuit is above the acceptable range. High voltage in this circuit can cause the solenoid to malfunction, leading to improper regulation of hydraulic pressure within the transmission, resulting in shifting problems and transmission damage over time.

Step-by-step diagnostic guide

ActionDescriptionTools Needed
Check for Other CodesUse an OBD-II scanner to check for additional fault codes that may give more context about the high voltage issue.OBD-II Scanner
Test for High VoltageUse a multimeter to test the voltage in the pressure control solenoid ‘C’ circuit. Compare the readings with the manufacturer’s specifications to confirm if the voltage is too high.Multimeter
Inspect Wiring and ConnectorsInspect the wiring and connectors for signs of damage, corrosion, or loose connections that could cause high voltage in the solenoid circuit.Flashlight, Multimeter
Test the SolenoidTest the pressure control solenoid ‘C’ for proper operation. Replace the solenoid if it is malfunctioning or receiving excessive voltage.Diagnostic Tool, Replacement Solenoid
Clear the Code and Test DriveAfter completing repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved.OBD-II Scanner, Vehicle Owner’s Manual
Recheck for CodesRe-scan the system to ensure the P0971 code does not reappear after the test drive.OBD-II Scanner
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