P0652 Sensor Reference Voltage 2 Circuit Low

P0652 code - When the Powertrain Control Module (PCM) recognizes the 5-volt supply circuit voltage is too low. One trip fault, ETC light is flashing.

P0652


Possible causes P0652 code

- 5-volt supply shorted to ground
- MAP sensor
- Camshaft Position Sensor 1
- Camshaft Position Sensor 2
- APP sensor
- Variable Line pressure sensor
- Transmission Temperature sensor
- Powertrain Control Module (PCM)

Diagnose P0652 code

Step 1. Active DTC
Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test. Turn the ignition on for at least 60 seconds, with the scan tool read the active DTCs.

Is the DTC active at this time?

Yes, go to step 2.
No, perform the PCM intermittent condition.

Step 2.Check the 5-volt supply circuit and the 5-volt supply circuit for a short to ground
Turn the ignition off, disconnect the PCM harness connectors, disconnect all the sensors that the 5-volt supply circuit. Disconnect the APP sensor harness connector, measure the resistance between ground and the 5-volt supply circuit in the MAP sensor harness connector. Measure the resistance between ground and 5-volt supply circuit in the APP harness connector.

Is the resistance above 10k Ohms in both circuits?

Yes, go to step 3.
No, repair the 5-volt supply circuit ot the 5-volt supply circuit for a short to ground.

Step 3. CMP sensor
Reconnect the PCM harness connectors, reconnect all previously disconnected sensors except for the CMP 1/1 sensor harness connector. Ignition on engine not running, measure the voltage on the 5-volt supply circuit in the CMP 1/1 sensor harness connector.

Is the voltage below 4.5 volts?

Yes, go to step 4.
No, verify that there is good pin to terminal contact in the CMP sensor and Powertrain Control Module (PCM) connectors. If OK, replace the camshaft position sensor.

Step 4. Sensor shorted to ground
Measure the voltage on the 5-volt supply circuit at the CMP 1/1 sensor harness connector. You must tirn the ignition OFF when disconnecting any of the sensor harness connectors and turn the ignition on to check the voltage readings. While monitoring the voltage, disconnect each sensor harness connector that shares the 5-volt supply circuit, one at a time including the APP sensor harness connector.

Does the voltage increase above 4.5 volts when disconnecting any of the sensor harness connectors?

Yes, verify that there is good pin to terminal contact in the related sensor and Powertrain Control Module (PCM) connectors. If OK, replace the sensor that causes the 5-volt supply circuit voltage to increase when disconnected.
No, go to step 5.

Step 5. Powertrain Control Module (PCM)

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