P1631 2017 Toyota RAV4 Code - Communication Error from ECM to VSC
Quick Answer
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. Common causes include Faulty Skid Control ECU (Brake Actuator Assembly), Skid Control ECU harness is open or shorted, Skid Control ECU circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1631 2017 Toyota RAV4 indicates Communication Error from ECM to VSC.
- Common causes
- Common causes include Faulty Skid Control ECU (Brake Actuator Assembly), Skid Control ECU harness is open or shorted, Skid Control ECU circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1631 2017 Toyota RAV4 Description
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.
What are the Possible Causes of the DTC P1631 2017 Toyota RAV4?
- 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)
How to Fix the DTC P1631 2017 Toyota RAV4?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1631 2017 Toyota RAV4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P1631 2017 Toyota RAV4 code?
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Frequently Asked Questions about P1631 2017 Toyota RAV4 Code
What does OBDII code P1631 mean on a 2017 Toyota RAV4?
1. P1631 indicates a communication error between the Engine Control Module (ECM) and the Vehicle Stability Control (VSC) system. 2.
What are the common symptoms of P1631?
Symptoms may include the check engine light turning on, VSC warning light illuminating, loss of traction control functionality, or reduced engine performance. 3.
What causes the P1631 code to trigger?
Common causes include faulty wiring or connectors between the ECM and VSC, a malfunctioning ECM, a defective VSC module, or software compatibility issues. 4.
Can I drive my 2017 Toyota RAV4 with the P1631 code?
While the vehicle may be drivable, you may experience reduced stability and traction control, which could compromise safety in certain conditions. 5.
How do I diagnose the P1631 code?
Start by inspecting wiring and connectors for damage or corrosion, checking for fault codes in both the ECM and VSC modules, and testing communication signals with a diagnostic scanner. 6.
What tools are needed to fix the P1631 code?
You may need an OBDII scanner, a multimeter for testing electrical circuits, and appropriate wiring diagrams for your 2017 Toyota RAV4. 7.
How much does it cost to repair the P1631 code?
The cost can vary depending on the issue, ranging from $100 for simple wiring repairs to $1,000 or more if a module replacement is needed. 8.
Can a software update fix the P1631 code?
Yes, in some cases, a software update for the ECM or VSC module may resolve compatibility or communication issues. 9.
What should I check first when troubleshooting P1631?
Begin by visually inspecting the wiring and connectors between the ECM and VSC module for signs of damage, corrosion, or loose connections. 10.
Do I need to replace the ECM or VSC module for P1631?
Module replacement is only necessary if diagnostic testing confirms that either the ECM or VSC module is defective and cannot communicate properly.
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