AutoCodes – Cadillac – P1A36 Cadillac

P1A36 Cadillac Code - Hybrid Battery 3 Voltage High

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: P1A36 Cadillac indicates Hybrid Battery 3 Voltage High.
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 812

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 P1A36 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 P1A36 Cadillac - Hybrid Battery 3 Voltage High - AutoCodes.com — P1A36 Cadillac Code - Hybrid Battery 3 Voltage High

What does this mean?

What are the Possible Causes of the DTC P1A36 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 P1A36 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 P1A36 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 P1A36 Cadillac Code

1. What does the OBDII code P1A36 mean on a Cadillac?

The P1A36 code indicates "Hybrid Battery 3 Voltage High," meaning one of the hybrid battery modules is reporting a voltage that exceeds the specified range.

2. What are the common symptoms of code P1A36 in a Cadillac?

Symptoms may include a check engine light, reduced hybrid performance, decreased fuel efficiency, and possible warning messages about the hybrid system on the dashboard.

3. What causes the P1A36 code to appear on a Cadillac?

The code can be caused by a faulty hybrid battery module, an issue with the voltage sensor, wiring problems, or a malfunction in the hybrid control module.

4. Can I continue driving my Cadillac with the P1A36 code?

Driving with this code is not recommended since it can lead to further hybrid system damage or reduced vehicle performance.

5. How is the P1A36 code diagnosed?

A technician will use a scan tool to monitor the hybrid battery's voltage levels, check for wiring issues, and test the battery modules for irregularities.

6. What repairs are typically needed for the P1A36 code?

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

7. How much does it cost to fix the P1A36 code on a Cadillac?

Costs can vary widely, but hybrid battery module repairs or replacements may range from $1,000 to $4,000, depending on the extent of the problem.

8. Can a weak 12V battery cause the P1A36 code in a Cadillac?

While a weak 12V battery can cause hybrid system issues, this code specifically relates to the high voltage hybrid battery, not the 12V system.

9. How can I prevent the P1A36 code from recurring?

Regular maintenance of the hybrid system, including software updates and periodic checks of the hybrid battery, can help prevent this code from recurring.

10. Is the P1A36 code covered under warranty for a Cadillac?

The hybrid battery may be covered under the manufacturer's hybrid system warranty, which typically lasts longer than the standard powertrain warranty. Check with your dealer for details.