AutoCodes – Cadillac – P1A2A Cadillac

P1A2A Cadillac Code - Hybrid Battery 2 Circuit High Voltage

Quick Answer

Battery voltage sensors allow the Energy Storage Control Module (ESCM) to monitor the voltage of the batteries in the Energy Storage Box (ESB). Common causes include Faulty Energy Storage Box (ESB) Battery, Faulty Battery Energy Control Module (BECM), Battery Energy Control Module (BECM) harness is open or shorted. 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: P1A2A Cadillac indicates Hybrid Battery 2 Circuit High Voltage.
Common causes: Common causes include Faulty Energy Storage Box (ESB) Battery, Faulty Battery Energy Control Module (BECM), Battery Energy Control Module (BECM) harness is open or shorted.
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 857

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 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A2A Cadillac Description

Battery voltage sensors allow the Energy Storage Control Module (ESCM) to monitor the voltage of the batteries in the Energy Storage Box (ESB). The batteries apply voltage to internal input resistors that are connected to the signal circuits of the battery voltage sensors. The module provides ground to the battery voltage sensors through the reference circuit. The ESCM monitors the voltage drop across the battery voltage sensors and uses the inputs for hybrid calculations. When the battery voltage is high, the resistances of the sensors are high and the voltage signals are high. When the battery voltage is low, the resistances of the sensors are low and the voltage signals are low.

OBDII Code P1A2A Cadillac - Hybrid Battery 2 Circuit High Voltage - AutoCodes.com — P1A2A Cadillac Code - Hybrid Battery 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1A2A Cadillac?

Faulty Energy Storage Box (ESB) Battery
Faulty Battery Energy Control Module (BECM)
Battery Energy Control Module (BECM) harness is open or shorted
Battery Energy Control Module (BECM) circuit poor electrical connection

How to Fix the DTC P1A2A Cadillac?

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 P1A2A Cadillac 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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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 P1A2A Cadillac Code

1. What does the OBDII code P1A2A mean on a Cadillac?

The P1A2A code indicates "Hybrid Battery 2 Circuit High Voltage," meaning the vehicle's hybrid battery system has detected an abnormally high voltage in the second battery circuit.

2. What are the common symptoms of the P1A2A code in a Cadillac?

Symptoms may include the check engine light or hybrid system warning light turning on, reduced fuel efficiency, limited hybrid system performance, or the vehicle entering "limp" mode.

3. What causes the P1A2A code on a Cadillac?

Common causes include a malfunctioning hybrid battery module, damaged wiring or connections in the battery circuit, a failed battery control module, or a fault in the voltage sensor.

4. Can I drive my Cadillac with the P1A2A code active?

Itâ€™s not recommended to drive with the P1A2A code active, as it may lead to further damage to the hybrid system or cause the vehicle to lose power unexpectedly.

5. How do you diagnose the P1A2A code on a Cadillac?

Diagnosis involves scanning the vehicle with an advanced OBDII scanner, inspecting the hybrid battery and related wiring for damage or corrosion, and testing the battery control module for faults.

6. What repairs are needed to fix the P1A2A code?

Repairs may include replacing the hybrid battery module, repairing or replacing damaged wiring, cleaning or tightening electrical connections, or replacing the battery control module if defective.

7. Is the P1A2A code specific to Cadillac vehicles?

While the P1A2A code is common on Cadillac hybrid models, it can also appear on other GM vehicles with hybrid systems using similar technology.

8. How much does it cost to fix the P1A2A code on a Cadillac?

Repair costs vary depending on the issue, but replacing a hybrid battery module can cost $2,000â€“$4,000, while wiring repairs or module replacements may cost a few hundred dollars.

9. Can a low 12V auxiliary battery cause the P1A2A code?

While uncommon, a weak or failing 12V auxiliary battery can sometimes affect hybrid system diagnostics, so itâ€™s worth checking.

10. How can I prevent the P1A2A code from occurring again?

Regular maintenance of the hybrid system, inspecting battery connections, and promptly addressing any warning lights can help prevent the P1A2A code from recurring.