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Engine-Codes – GMC – P037B GMC

P037B GMC Code - Wait To Start Indicator Control Circuit High Voltage

Quick Answer

The P037B GMC diagnostic trouble code refers to the "Wait To Start Indicator Control Circuit High Voltage." This code indicates that there is a high voltage condition detected in the control circuit for the wait to start indicator. Common causes include Faulty wiring or connections in the control circuit, Malfunctioning control module, Damaged wait to start indicator light. 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
P037B GMC indicates Wait To Start Indicator Control Circuit High Voltage.
Common causes
Common causes include Faulty wiring or connections in the control circuit, Malfunctioning control module, Damaged wait to start indicator light.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P037B GMC Description

The P037B GMC diagnostic trouble code refers to the "Wait To Start Indicator Control Circuit High Voltage." This code indicates that there is a high voltage condition detected in the control circuit for the wait to start indicator. The wait to start indicator is a feature in diesel vehicles that signals the driver to wait before starting the engine until the glow plugs have had enough time to heat up.

OBDII Code P037B GMC - Wait To Start Indicator Control Circuit High Voltage
P037B GMC Code - Wait To Start Indicator Control Circuit High Voltage

Common Causes of P037B GMC

  1. Faulty wiring or connections in the control circuit
  2. Malfunctioning control module
  3. Damaged wait to start indicator light
  4. Issues with the glow plug system
  5. Corrosion or moisture in the electrical components

Symptoms of P037B GMC

  1. Difficulty starting the engine, especially in cold weather
  2. Illumination of the check engine light
  3. Inoperative wait to start indicator light
  4. Reduced fuel efficiency
  5. Rough idling or stalling

How to Fix P037B GMC

  1. Perform a thorough inspection of the wiring and connections in the control circuit to check for any damage or loose connections.
  2. Test the control module to determine if it is functioning correctly or needs replacement.
  3. Check the wait to start indicator light for any damage or malfunction and replace if necessary.
  4. Inspect the glow plug system and replace any faulty components as needed.
  5. Clear the diagnostic trouble codes and test the vehicle to ensure the issue has been resolved.

Cost to Fix P037B GMC

The typical repair costs for addressing the P037B GMC diagnostic trouble code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair can range from $50 to $200, with labor costs typically adding another $100 to $200. Overall, the total repair costs for this issue may fall within the range of $150 to $400. It is important to keep in mind that the actual costs can vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. It is advisable to consult with a professional mechanic for a more accurate estimate based on the specific circumstances.

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Information for Specific GMC Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P037B GMC Code

1. What does the OBDII code P037B mean on a GMC vehicle?

P037B indicates a high voltage issue in the Wait to Start Indicator Control Circuit, which is part of the system that communicates with the glow plug system in diesel engines.

2. What are the common symptoms of a P037B code?

Symptoms may include a malfunctioning or unresponsive "Wait to Start" indicator light, extended engine cranking times, or difficulty starting the engine in cold conditions.

3. What causes the P037B code to appear?

Common causes include a faulty Wait to Start indicator light, a shorted or open circuit in the wiring, a damaged control module, or corroded electrical connections.

4. Can I drive my GMC vehicle with a P037B code?

While the vehicle may still be drivable, ignoring this code could lead to starting difficulties, particularly in colder weather, and may result in additional stress on the glow plug system.

5. How can I diagnose the P037B code?

Start by visually inspecting the wiring and connectors for damage or corrosion. Next, use a multimeter to check for proper voltage and continuity in the Wait to Start circuit.

6. What repairs are typically needed to fix the P037B code?

Repairs may include replacing the Wait to Start indicator light, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming/replacing the control module if necessary.

7. How much does it cost to fix the P037B code on a GMC?

Repair costs can vary, but minor fixes like repairing wiring or replacing the indicator light may cost $50-$150. If a control module replacement is needed, costs could exceed $500.

8. Can a bad glow plug system trigger the P037B code?

While the glow plug system itself may not directly cause this code, issues with the system can indirectly affect the Wait to Start indicator circuit.

9. Will resetting the code fix the issue?

Clearing the code without addressing the underlying problem will only temporarily remove the warning. The code will likely return until the issue is properly resolved.

10. Can a failing PCM cause the P037B code?

Yes, a failing Powertrain Control Module (PCM) or Engine Control Module (ECM) can potentially cause this code if it fails to properly regulate voltage in the Wait to Start circuit.

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