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AutoCodes – Chevrolet – P037A Chevrolet

P037A Chevrolet Code - Wait To Start Indicator Control Circuit Low Voltage

Quick Answer

Ignition voltage is supplied directly to the Wait To Start indicator. Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster 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
P037A Chevrolet indicates Wait To Start Indicator Control Circuit Low Voltage.
Common causes
Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster 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.
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Code Popularity 422
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jun 17, 2022
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Code P037A Chevrolet Description

Ignition voltage is supplied directly to the Wait To Start indicator. The Engine Control Module (ECM) controls the lamp by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver has a fault line which is monitored by the ECM. When the ECM is commanding a component ON, the voltage of the control circuit should be low, near zero volts. When the ECM is commanding the control circuit to a component OFF, the voltage potential of the circuit should be high, near battery voltage. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a short to ground on the Wait To Start Indicator Control circuit for greater than 3 s.
OBDII Code P037A Chevrolet - Wait To Start Indicator Control Circuit Low Voltage - AutoCodes.com
P037A Chevrolet Code - Wait To Start Indicator Control Circuit Low Voltage
What does this mean?

What are the Possible Causes of the DTC P037A Chevrolet?

  • Faulty Instrument Cluster
  • Instrument Cluster harness is open or shorted
  • Instrument Cluster circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P037A Chevrolet?

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 P037A Chevrolet 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 P037A Chevrolet code?

Need more information on how to fix the P037A Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P037A Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet 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 P037A Chevrolet Code

1. What does the OBDII code P037A mean on a Chevrolet?

P037A indicates a "Wait To Start Indicator Control Circuit Low Voltage," which relates to the pre-glow system in diesel engines.

2. What are the common symptoms of the P037A code in a Chevrolet?

Symptoms may include the wait-to-start indicator not functioning, longer engine cranking times, or difficulty starting the engine in cold weather.

3. What causes the P037A code on a Chevrolet?

Common causes include a faulty glow plug control module, damaged wiring or connectors in the circuit, a failed wait-to-start indicator bulb, or a weak battery.

4. Can I drive my Chevrolet with the P037A code?

While the vehicle may still be drivable, starting issues in cold weather could worsen, so it’s best to address the issue promptly.

5. How do I diagnose the P037A code on my Chevrolet?

Check the glow plug module, inspect the wiring and connectors for damage or corrosion, and test the wait-to-start indicator bulb for functionality.

6. How do I fix the P037A code in a Chevrolet?

Repairs may involve replacing the glow plug control module, repairing damaged wiring, replacing the indicator bulb, or ensuring the battery is fully charged.

7. How much does it cost to fix the P037A code on a Chevrolet?

Repair costs vary but typically range from $100 to $300, depending on whether the glow plug module, wiring, or indicator bulb needs replacement.

8. Will clearing the code fix the P037A issue in my Chevrolet?

Clearing the code may temporarily reset the check engine light, but the underlying issue must be resolved to prevent the code from returning.

9. How does cold weather affect the P037A code in a Chevrolet?

Cold weather can exacerbate starting issues caused by this code, as the glow plug system is essential for diesel engine startups in low temperatures.

10. Can a weak battery trigger the P037A code on a Chevrolet?

Yes, a weak or failing battery can cause low voltage in the circuit, potentially triggering the P037A code.

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