AutoCodes – Saturn – P1A88 Saturn

P1A88 Saturn Code - 42 Volt System Performance

Quick Answer

The Accessory DC Power Control Module (APM) supplies the energy that flows between the high voltage, 300 volt, Direct Current (DC) and intermediate voltage, 42 volt, DC to support the Electric Power Steering (EPS). Common causes include Faulty Accessory DC Power Control Module (APM), Accessory DC Power Control Module (APM) harness is open or shorted, Accessory DC Power Control Module (APM) 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: P1A88 Saturn indicates 42 Volt System Performance.
Common causes: Common causes include Faulty Accessory DC Power Control Module (APM), Accessory DC Power Control Module (APM) harness is open or shorted, Accessory DC Power Control Module (APM) 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 1,370

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A88 Saturn Description

The Accessory DC Power Control Module (APM) supplies the energy that flows between the high voltage, 300 volt, Direct Current (DC) and intermediate voltage, 42 volt, DC to support the Electric Power Steering (EPS). The APM receives a 42 volt enable command from the Hybrid Powertrain Control Module (HPCM) over the high speed hybrid GMLAN communication circuit.
The APM continuously monitors the status of its 42 volt circuitry. It will do some diagnostics on this circuitry when the ignition key is first turned to RUN. Additional diagnostics are run while the APM is doing 42 volt conversions after receiving the 42 volt enable command.

OBDII Code P1A88 Saturn - 42 Volt System Performance - AutoCodes.com — P1A88 Saturn Code - 42 Volt System Performance

What does this mean?

What are the Possible Causes of the DTC P1A88 Saturn?

Faulty Accessory DC Power Control Module (APM)
Accessory DC Power Control Module (APM) harness is open or shorted
Accessory DC Power Control Module (APM) circuit poor electrical connection

How to Fix the DTC P1A88 Saturn?

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 P1A88 Saturn 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 P1A88 Saturn code?

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Need Help with the Code?

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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 P1A88 Saturn Code

What does the OBDII code P1A88 mean for my Saturn?

The OBDII code P1A88 indicates a performance issue with the 42-volt system, which is part of the vehicle's hybrid or electric powertrain.

What are the common symptoms of a P1A88 code?

Common symptoms include reduced engine power, warning lights on the dashboard, and possible issues with acceleration or vehicle performance.

What could cause the P1A88 code to trigger?

Possible causes include a malfunctioning hybrid battery, issues with the power electronics control module, or problems with the wiring and connectors in the 42-volt system.

Is it safe to drive my Saturn with a P1A88 code?

While it may still be drivable, it's advisable to have the issue diagnosed and repaired promptly, as it can lead to more significant problems or reduced performance.

How can I diagnose the P1A88 code?

Diagnostic steps may include using a scan tool to read the code, inspecting the hybrid battery and associated wiring, and checking the power electronics control module for faults.

What repairs might be needed for a P1A88 code?

Repairs may include replacing the hybrid battery, repairing or replacing damaged wiring, or reprogramming or replacing the power electronics control module.

Can I reset the P1A88 code after repairs?

Yes, after making the necessary repairs, you can clear the code using an OBDII scanner. However, ensure that the underlying issue has been fixed to prevent the code from reappearing.

How much might it cost to fix a P1A88 code?

Repair costs can vary widely depending on the specific issue, but addressing hybrid battery problems or control module replacements can be expensive, often ranging from several hundred to a few thousand dollars.

Will my vehicle pass emissions testing with a P1A88 code?

No, if the P1A88 code is present and the Check Engine light is illuminated, your vehicle will likely fail emissions testing until the issue is resolved and the code is cleared.