[SOLVED] Dodge P0646 Code: Quick Fix For Ac Clutch Relay Voltage

The OBD code P0646 for Dodge indicates a fault with the Air Conditioning Clutch Relay Control Circuit.

Symptoms include the Engine Light being ON.

This issue is commonly caused by a faulty Air Conditioning Clutch Relay or related wiring harness issues.

It is not a severe problem but should be addressed promptly.

To fix it, inspect the wiring harness and connectors for any damage or poor connections.

Repair Importance Level	3.33 (Out of 10)
Estimated Repair Time	Approximately 1.0 hour
Repair Difficulty Level	10.0 (Out of 10)

Symptoms of the Dodge p0646 OBD Code

The Dodge P0646 fault code indicates a problem with the A/C clutch relay control circuit.

Symptoms: Engine Light ON.
Vehicle may experience difficulty starting.
Engine may run rough or stall at idle.
Reduced engine power may be felt during acceleration.
The vehicle may go into a limp mode.

Causes of the Dodge p0646 OBD Code

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Possible triggers for Dodge fault code P0646 include issues with the A/C clutch relay control circuit.

P0646 can be caused by a faulty Air Conditioning Clutch Relay.
An open or shorted Air Conditioning Clutch Relay harness.
A poor electrical connection in the Air Conditioning Clutch Relay circuit.

Fixing Dodge Error Code p0646 Step By Step

Address the issue by inspecting the A/C clutch relay circuit for Dodge code P0646.

To fix the Dodge OBDII code P0646, start by reviewing the possible causes mentioned above.
Visually examine the corresponding wiring harness and connectors for any damage.
Inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
Check the wiring connections to the A/C clutch relay for any issues.
Test the A/C clutch relay operation and replace it if necessary.
Clear the fault codes and perform a test drive to verify that the issue has been resolved.

Cost Of Fixing Dodge p0646 Fault Code

The repair for Dodge fault code P0646 may involve replacing the A/C clutch relay control circuit.

The cost to diagnose and fix Dodge OBD code P0646 is based on an estimated 1. 0hour repair time.

Labor rates usually range from $75 to $150 per hour, so the total cost will depend on the shop’s rates and the complexity of the repair.

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Details of the Dodge p0646 OBD Code

Dodge fault code P0646 relates to the A/C clutch relay control circuit.

Dodge OBD code P0646 means A/C Clutch Relay Control Circuit Low.

This code is triggered when the Engine Control Module (ECM) detects a low voltage condition in the control circuit for the A/C clutch relay.

The A/C clutch relay is responsible for engaging and disengaging the air conditioning compressor.

When the ECM detects a low voltage in this circuit, it sets code P0646. This code is related to the operation of the A/C system in the vehicle.

Mechanic’s Tech Notes

Troubleshooting for Dodge fault code P0646 related to A/C clutch relay control circuit.

OBDII code P0646 in a Dodge typically indicates a fault with the A/C clutch relay control circuit.

To diagnose, use a voltmeter to check for power and ground at the Transmission Control Module (TCM).

Utilize a scan tool to confirm TCM communication over the Controller Area Network (CAN) network.

If no issues are found with wiring or connectors, reprogramming the TCM may be necessary.

Ensure to inspect the A/C clutch relay and related components for any damage.

If the relay is faulty, replacing it should resolve the issue.

FAQ

1. What does OBD code P0646 mean in a Dodge vehicle?

OBD code P0646 in a Dodge means an issue with the Air Conditioning Clutch Relay circuit. Check relay, harness, and connections for faults.

2. What are the common symptoms associated with OBD code P0646 in a Dodge vehicle?

Common symptoms of OBD code P0646 in a Dodge vehicle include the Engine Light ON and possible issues with the Air Conditioning Clutch Relay circuit.

3. How can I diagnose and repair OBD code P0646 in my Dodge vehicle?

Diagnose and repair OBD code P0646 in Dodge: Symptoms Engine Light ON. Causes Faulty AC Clutch Relay, harness issues. Fix Inspect and repair wiring and connectors.

Wrap Up

If your Dodge is displaying OBD code P0646 and experiencing issues with the A/C system, it could be caused by a faulty A/C clutch relay control circuit.

This code typically indicates a problem with the A/C clutch relay control circuit voltage being too low.

To address Dodge OBD code P0646, start by checking the A/C clutch relay and its wiring for any signs of damage or corrosion.

Test the relay operation and ensure proper voltage is reaching the circuit.

Replace the relay if necessary and repair any damaged wiring to resolve the issue.