AutoCodes – Cadillac – P1A2D Cadillac

P1A2D Cadillac Code - Hybrid Battery 2 Voltage Low

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: P1A2D Cadillac indicates Hybrid Battery 2 Voltage Low.
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 757

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 P1A2D 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 P1A2D Cadillac - Hybrid Battery 2 Voltage Low - AutoCodes.com — P1A2D Cadillac Code - Hybrid Battery 2 Voltage Low

What does this mean?

What are the Possible Causes of the DTC P1A2D 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 P1A2D 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 P1A2D 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.

Need more information about the P1A2D Cadillac 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 P1A2D Cadillac Code

1. What does the OBDII code P1A2D mean on a Cadillac?

P1A2D indicates "Hybrid Battery 2 Voltage Low," meaning the voltage in the second hybrid battery module is below the expected range.

2. What are the symptoms of the P1A2D code on a Cadillac?

Common symptoms include reduced fuel efficiency, diminished hybrid system performance, warning lights on the dashboard, and potential vehicle hesitation or limited power.

3. What causes the P1A2D code to appear in a Cadillac?

The code can be triggered by issues such as a deteriorated hybrid battery cell, faulty battery control module, poor battery connections, or damaged wiring.

4. Can I drive my Cadillac with the P1A2D code active?

Itâ€™s not recommended, as driving with this code can further damage the hybrid battery system and reduce vehicle performance. Have it inspected promptly.

5. How do you diagnose the P1A2D code in a Cadillac?

A technician will use a scan tool to confirm the code, check live data for battery voltage levels, inspect battery connections, and test the hybrid battery module.

6. Is the P1A2D code specific to the hybrid system in Cadillacs?

Yes, this code is specific to the hybrid system and pertains to the voltage levels in one of the hybrid battery modules.

7. What repairs might fix the P1A2D code on a Cadillac?

Repairs may include replacing the hybrid battery module, repairing or replacing wiring, cleaning corroded connections, or reprogramming the battery control module.

8. How much does it cost to fix the P1A2D code on a Cadillac?

The cost varies widely depending on whether the hybrid battery needs replacement, but repairs can range from a few hundred dollars for minor fixes to several thousand for a new battery.

9. Can a weak 12-volt battery cause the P1A2D code in a Cadillac?

No, this code specifically relates to the hybrid battery system and is not caused by the 12-volt auxiliary battery.

10. How can I prevent the P1A2D code from recurring?

Regular maintenance of the hybrid system, avoiding extreme temperatures, and promptly addressing any warning signs can help prevent this code from reappearing.