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U1895 GMC Code - Electro-Hydraulic Power Steering Module Lost Communication With Powertrain Control Module

Quick Answer

The U1895 diagnostic trouble code (DTC) indicates a communication failure between the Electro-Hydraulic Power Steering (EHPS) module and the Powertrain Control Module (PCM) in GMC vehicles. Common causes include Faulty wiring or connectors between the EHPS module and PCM, leading to poor communication, Malfunctioning Electro-Hydraulic Power Steering module that fails to send or receive signals, Defective Powertrain Control Module that is unable to communicate properly with the EHPS. 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
U1895 GMC indicates Electro-Hydraulic Power Steering Module Lost Communication With Powertrain Control Module.
Common causes
Common causes include Faulty wiring or connectors between the EHPS module and PCM, leading to poor communication, Malfunctioning Electro-Hydraulic Power Steering module that fails to send or receive signals, Defective Powertrain Control Module that is unable to communicate properly with the EHPS.
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 Oct 17, 2024
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Code U1895 GMC Description

The U1895 diagnostic trouble code (DTC) indicates a communication failure between the Electro-Hydraulic Power Steering (EHPS) module and the Powertrain Control Module (PCM) in GMC vehicles. This code is particularly relevant in vehicles equipped with an EHPS system, which utilizes hydraulic pressure generated by an electric motor to assist in steering. When the EHPS module loses communication with the PCM, it can lead to a range of performance issues.

OBDII Code U1895 GMC - Electro-Hydraulic Power Steering Module Lost Communication With Powertrain Control Module
U1895 GMC Code - Electro-Hydraulic Power Steering Module Lost Communication With Powertrain Control Module

Common Causes of U1895 GMC

  1. Faulty wiring or connectors between the EHPS module and PCM, leading to poor communication.
  2. Malfunctioning Electro-Hydraulic Power Steering module that fails to send or receive signals.
  3. Defective Powertrain Control Module that is unable to communicate properly with the EHPS.
  4. Software issues or glitches within the PCM that affect communication protocols.
  5. Environmental factors such as corrosion or moisture that disrupt electrical connections.

Symptoms of U1895 GMC

  1. Increased steering effort, particularly during low-speed maneuvers.
  2. Intermittent or complete loss of power steering assist.
  3. Warning lights illuminated on the dashboard, such as the power steering warning light.
  4. Erratic steering behavior, including unresponsive or overly sensitive steering.
  5. Diagnostic scanner indicates U1895 code along with other related codes (e.g., U codes related to communication).

How to Fix U1895 GMC

  1. Visual Inspection: Begin with a thorough visual inspection of the wiring harness and connectors between the EHPS module and the PCM. Look for signs of damage, corrosion, or loose connections.
  2. Check for Faulty Components: Use a diagnostic scanner to check for additional codes that may indicate a faulty EHPS module or PCM. If either component is found to be defective, replacement may be necessary.
  3. Repair or Replace Wiring: If damaged wiring or connectors are identified, repair or replace them to restore proper communication.
  4. Software Update: If the PCM is functioning correctly but communication issues persist, check for any available software updates for the PCM that may resolve communication problems.
  5. Test Drive: After repairs, perform a test drive to ensure that the power steering system is functioning correctly and that the U1895 code does not reappear.

Cost to Fix U1895 GMC

The typical repair costs for addressing a U1895 code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $200 and $800 for repairs, which may include parts and labor. Labor costs can range from $80 to $150 per hour, depending on the location and type of repair shop. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer more competitive pricing. It's advisable to consult local repair shops for a more precise estimate based on your vehicle's make, model, and specific issues.

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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 U1895 GMC Code

1. What does the OBDII code U1895 mean on a GMC vehicle?

U1895 indicates a communication failure between the Electro-Hydraulic Power Steering (EHPS) Module and the Powertrain Control Module (PCM).

2. What are the common symptoms of code U1895 in a GMC?

Symptoms may include loss of power steering assist, a warning light on the dashboard, intermittent steering issues, or reduced steering performance.

3. What causes the U1895 code to appear in a GMC?

Possible causes include faulty wiring or connectors, a malfunctioning EHPS module, a defective PCM, or network communication issues within the vehicle.

4. Can I still drive my GMC with a U1895 code?

While the vehicle may still be drivable, steering effort may increase significantly, especially at low speeds, which can compromise safety.

5. How do I fix the U1895 code on my GMC?

Start by inspecting the wiring and connectors between the EHPS module and PCM for damage or loose connections. If no issues are found, further diagnostics may require testing or replacing the EHPS module or PCM.

6. Does clearing the U1895 code solve the problem?

Clearing the code will reset the warning temporarily, but if the underlying issue is not resolved, the code and symptoms will likely return.

7. How much does it cost to repair a U1895 code on a GMC?

Repair costs can vary widely depending on the cause but may range from $100 for a wiring repair to over $1,000 if a module replacement is required.

8. Can a U1895 code be caused by a dead battery?

Yes, a weak or dead battery can cause communication errors like U1895. Ensure the battery and charging system are functioning properly before further diagnosis.

9. What tools are needed to diagnose a U1895 code?

You’ll need an advanced OBDII scan tool capable of reading manufacturer-specific codes and accessing module communication data.

10. Should I take my GMC to a professional for a U1895 code?

If basic checks and repairs don’t resolve the issue, it’s recommended to consult a professional technician with experience in diagnosing communication network problems.

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