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P1631 Toyota Code - Communication Error from ECM to VSC

- Code Popularity: 3,895 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P1631 Toyota?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Skid Control ECU (Brake Actuator Assembly)
  • Skid Control ECU harness is open or shorted
  • Skid Control ECU circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P1631 Toyota?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1631 Toyota code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P1631 Toyota Description

The Engine Control Module (ECM) sends signals such as A/T information signals, dynamic radar cruise control operation signals, and brake operation demand signals to the Skid Control Electronic Control Unit (ECU) (Brake Actuator Assembly) when the dynamic radar cruise control is operating. The ECM is the only component that has a function to store and output Diagnostic Trouble Codes (DTC)s in the dynamic radar cruise control system. Therefore, if the Skid Control ECU (Brake Actuator Assembly) detects a communication error from the ECM, it sends a malfunction signal back to the ECM.
While the vehicle speed is 40 km/h (25 mph) or more and the dynamic radar cruise control system is operating (vehicle-to-vehicle distance control mode), if the ECM continuously receives a logical error signal from the skid control ECU (brake actuator assembly) for approximately 1 second or more the Diagnostic Trouble Code (DTC) will be set.

OBDII Code P1631 Toyota - Communication Error from ECM to VSC - AutoCodes.com
P1631 Toyota Code - Communication Error from ECM to VSC

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Code P1631 Toyota comments

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