AutoCodes – Saturn – P1A8B Saturn

P1A8B Saturn Code - Volt Inverter Temperature High

Quick Answer

The Accessory Power Module (APM) controls the energy flowing 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 Restricted radiator air flow or coolant fans inoperative, Restricted power electronics coolant flow or contaminated coolant, Inoperative power electronics cooling system water pump. 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: P1A8B Saturn indicates Volt Inverter Temperature High.
Common causes: Common causes include Restricted radiator air flow or coolant fans inoperative, Restricted power electronics coolant flow or contaminated coolant, Inoperative power electronics cooling system water pump.
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 1,034

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 Jul 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A8B Saturn Description

The Accessory Power Module (APM) controls the energy flowing 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. APM functions will run only when the APM Enable is active on the high speed hybrid GMLAN communication circuit.
Heat is generated in the 42-volt APM circuit solely through the demand for use of the EPS. The Engine Control Module (ECM) measures the temperature of the Power Electronics Cooling Loop and commands the flow of 2 electrical coolant pumps. The APM transfers heat in the 42-volt circuit to the APM Heat Plate which is then dissipated at the Power Electronics Front End Heat Exchanger.
Based on the severity of an overheat condition in the 42-volt circuit, the APM will make decisions ranging from notification of an over temperature condition to the EPS to completely shutting down the 42-volt power conversion.

OBDII Code P1A8B Saturn - Volt Inverter Temperature High - AutoCodes.com — P1A8B Saturn Code - Volt Inverter Temperature High

What does this mean?

What are the Possible Causes of the DTC P1A8B Saturn?

Restricted radiator air flow or coolant fans inoperative
Restricted power electronics coolant flow or contaminated coolant
Inoperative power electronics cooling system water pump
Faulty Accessory Power Module (APM)
Accessory Power Module (APM) harness is open or shorted
Accessory Power Module (APM) circuit poor electrical connection

How to Fix the DTC P1A8B 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 P1A8B 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.

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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 P1A8B Saturn Code

1. What are the common symptoms of OBDII code P1A8B Saturn (Volt Inverter Temperature High)?

When this code is triggered, you may experience reduced performance, the vehicle going into a reduced power mode, and possibly a warning light on the dashboard.

2. What are the possible causes of OBDII code P1A8B Saturn (Volt Inverter Temperature High)?

The causes can include a malfunctioning inverter coolant pump, a faulty temperature sensor, a problem with the inverter cooling system, or issues with the inverter itself.

3. How can I diagnose the reason behind OBDII code P1A8B Saturn (Volt Inverter Temperature High)?

To diagnose this code, it is recommended to use a diagnostic scanner to read the specific details of the fault codes, inspect the inverter coolant pump and system, check the temperature sensor, and examine the inverter for any visible damage.

4. What are some repair tips for fixing OBDII code P1A8B Saturn (Volt Inverter Temperature High)?

Repair tips include checking and possibly replacing the inverter coolant pump, testing and replacing the temperature sensor if necessary, ensuring proper functioning of the inverter cooling system, and addressing any issues with the inverter itself.

5. Can driving with OBDII code P1A8B Saturn (Volt Inverter Temperature High) cause further damage to the vehicle?

Continuing to drive with this code present can potentially cause damage to the inverter system, reduce overall vehicle performance, and may lead to more severe issues if left unresolved.

6. Is it safe to continue driving my Saturn with OBDII code P1A8B (Volt Inverter Temperature High) if the symptoms are not severe?

It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage and potentially unsafe driving conditions. It is best to address the issue as soon as possible.

7. Can I reset the OBDII code P1A8B Saturn (Volt Inverter Temperature High) on my own?

While you can clear the code with an OBDII scanner, it is important to diagnose and repair the underlying issue causing the code before clearing it to prevent it from reoccurring.

8. How much does it typically cost to repair OBDII code P1A8B Saturn (Volt Inverter Temperature High)?

The cost of repairing this code can vary depending on the specific cause of the issue, but it may involve replacing parts such as the inverter coolant pump or temperature sensor, as well as labor costs for diagnosis and repair.

9. Are there any recalls or technical service bulletins related to OBDII code P1A8B Saturn (Volt Inverter Temperature High)?

It is recommended to check with a Saturn dealership or online resources for any recalls or technical service bulletins related to this specific OBDII code to see if there are known issues or solutions provided by the manufacturer.

10. How can I prevent OBDII code P1A8B Saturn (Volt Inverter Temperature High) from occurring in the future?

Regular maintenance, such as checking the inverter cooling system, monitoring coolant levels, and addressing any cooling system issues promptly, can help prevent this OBDII code from occurring in the future.