P1631 Scion 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 Scion 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 Scion 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 Scion?
- 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 Scion?
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 Scion 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.
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Frequently Asked Questions about P1631 Scion Code
1. What does OBDII code P1631 for a Scion mean?
The P1631 code indicates a communication error between the Engine Control Module (ECM) and the Vehicle Stability Control (VSC) system in a Scion vehicle.
2. What are the common symptoms of a P1631 fault in a Scion?
Common symptoms of a P1631 fault may include the VSC warning light illuminating on the dashboard, reduced engine performance, and potential traction control issues.
3. What are the possible causes of a communication error between the ECM and VSC in a Scion?
Potential causes of the ECM to VSC communication error include faulty wiring or connections, a malfunctioning ECM or VSC module, software glitches, or a weak battery.
4. How can I diagnose a P1631 code in my Scion?
Diagnosing a P1631 code typically involves using an OBDII scanner to retrieve the fault code, checking the wiring and connectors between the ECM and VSC, and conducting a thorough inspection of the related components.
5. Can I still drive my Scion with a P1631 fault code?
It is not recommended to drive your Scion with a P1631 fault code, as it can affect the vehicle's stability control system and potentially compromise safety. It is advisable to have the issue diagnosed and repaired promptly.
6. How can I repair a P1631 communication error in my Scion?
Repairing a P1631 fault may involve addressing any wiring issues, replacing faulty components such as the ECM or VSC module, updating software if required, and ensuring proper connections and grounds.
7. Is it possible to reset the P1631 code in a Scion without fixing the underlying issue?
While clearing the fault code may temporarily turn off the warning light, the issue causing the communication error between the ECM and VSC will persist unless properly diagnosed and repaired.
8. Can a DIY enthusiast fix a P1631 fault in a Scion?
Depending on the individual's skills and knowledge, some DIY enthusiasts may be able to address a P1631 fault by checking wiring and connections. However, complex issues or component replacements may require professional assistance.
9. How much does it cost to repair a P1631 fault in a Scion?
The cost of repairing a P1631 fault in a Scion can vary depending on the underlying cause, parts needed for replacement, labor costs, and whether the repair is performed at a dealership or an independent mechanic.
10. Will a P1631 fault code in a Scion cause the vehicle to fail an emissions test?
A P1631 fault code related to communication error between the ECM and VSC may not directly cause a Scion to fail an emissions test. However, it is essential to address and resolve any OBDII codes before undergoing emissions testing to ensure proper vehicle operation.
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