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AutoCodes – GMC – P037A 2017 GMC Sierra

P037A 2017 GMC Sierra 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 2017 GMC Sierra 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 128
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 2017 GMC Sierra 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 2017 GMC Sierra - Wait To Start Indicator Control Circuit Low Voltage - AutoCodes.com
P037A 2017 GMC Sierra Code - Wait To Start Indicator Control Circuit Low Voltage
What does this mean?

What are the Possible Causes of the DTC P037A 2017 GMC Sierra?

  • 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 2017 GMC Sierra?

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 2017 GMC Sierra 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 2017 GMC Sierra code?

Need more information on how to fix the P037A 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P037A 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2017 GMC Sierra Code

What does the OBDII code P037A mean for a 2017 GMC Sierra?

P037A indicates a low voltage issue in the Wait To Start Indicator Control Circuit, which is related to the diesel engine's glow plug system.

What are the symptoms of code P037A in a 2017 GMC Sierra?

Symptoms may include the Wait To Start light not illuminating, difficulty starting the engine, or extended cranking times in cold weather.

What causes the P037A code in a 2017 GMC Sierra?

Common causes include faulty wiring or connectors, a failed Wait To Start indicator bulb, or issues with the glow plug control module.

How is the P037A code diagnosed?

A mechanic will inspect the circuit for damaged wiring, test the Wait To Start bulb, and use a multimeter to check for proper voltage in the circuit.

Can I drive my 2017 GMC Sierra with the P037A code?

You can drive the vehicle, but it may struggle to start in colder conditions due to issues with the glow plug system.

How do I fix the P037A code on a 2017 GMC Sierra?

Repairs may involve replacing damaged wiring, fixing poor connections, or replacing the Wait To Start indicator bulb or glow plug control module.

How much does it cost to repair the P037A code on a 2017 GMC Sierra?

Repair costs vary, but fixing wiring or replacing a bulb may cost $50-$150, while replacing the glow plug control module can range from $200-$600.

Can a weak battery cause the P037A code?

Yes, a weak battery can contribute to the code by providing insufficient voltage to the Wait To Start Indicator Control Circuit.

Is the P037A code specific to diesel engines?

Yes, this code is specific to diesel engines with a Wait To Start indicator, as it relates to the glow plug system.

What happens if I ignore the P037A code on my 2017 GMC Sierra?

Ignoring the code can lead to difficulties starting the engine, especially in cold weather, and may cause further issues in the glow plug system.

Discuss the causes and fixes for P037A 2017 GMC Sierra OBDII Code

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