AutoCodes – Cadillac – B1911 Cadillac

B1911 Cadillac Code - Generator L Terminal Malfunction

Quick Answer

The Diagnostic Trouble Code (DTC) B1911 indicates a circuit malfunction is preventing the generator from charging. Common causes include Faulty Generator (Alternator), Generator harness is open or shorted, Generator 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: B1911 Cadillac indicates Generator L Terminal Malfunction.
Common causes: Common causes include Faulty Generator (Alternator), Generator harness is open or shorted, Generator 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 1,220

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 27, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1911 Cadillac Description

The Diagnostic Trouble Code (DTC) B1911 indicates a circuit malfunction is preventing the generator from charging. DTC B1911 will set when the Instrument Panel Cluster (IPC) determines that the circuit is grounded by the generator with the ignition switch in the RUN position and engine speed is greater than 600 RPM. This test is only performed when the ignition switch is in the RUN position, IPC measures engine speed greater than 600 RPM and vehicle diagnostics is not active. When DTC B1911 is set, IPC will display BATTERY NOT CHARGING message and the battery indicator will illuminate.

OBDII Code B1911 Cadillac - Generator L Terminal Malfunction - AutoCodes.com — B1911 Cadillac Code - Generator L Terminal Malfunction

What does this mean?

What are the Possible Causes of the DTC B1911 Cadillac?

Faulty Generator (Alternator)
Generator harness is open or shorted
Generator circuit poor electrical connection

How to Fix the DTC B1911 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 B1911 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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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 B1911 Cadillac Code

1. What does the OBDII code B1911 mean on a Cadillac?

The B1911 code indicates a "Generator L Terminal Malfunction," which refers to an issue with the alternator's L terminal communication circuit.

2. What are the symptoms of a B1911 code on a Cadillac?

Common symptoms include a charging system warning light, dim headlights, difficulty starting the engine, or a dead battery.

3. What causes the B1911 code to appear on a Cadillac?

Possible causes include a faulty alternator, damaged wiring or connectors in the L terminal circuit, a malfunctioning PCM (Powertrain Control Module), or poor electrical connections.

4. Can I drive my Cadillac with a B1911 code?

While it may be possible to drive for a short distance, the vehicle could eventually lose power if the alternator is not charging the battery. It's best to address the issue promptly.

5. How do I diagnose a B1911 code on a Cadillac?

Start by inspecting the alternator's L terminal wiring and connectors for damage or corrosion. Use a multimeter to test the circuit for continuity and ensure proper voltage signals.

6. Does the B1911 code always mean the alternator is bad?

No, the problem could also stem from damaged wiring, corroded connections, or a PCM issue rather than the alternator itself.

7. How do I fix the B1911 code on a Cadillac?

Repairs may include replacing the alternator, repairing or replacing damaged wiring or connectors, cleaning corroded terminals, or reprogramming/repairing the PCM.

8. How much does it cost to fix a B1911 code on a Cadillac?

The cost varies depending on the root cause. Replacing an alternator may cost $300â€“$800, while fixing wiring or connections may cost less.

9. Can a weak battery trigger the B1911 code on a Cadillac?

A weak or failing battery can contribute to charging system issues but is not typically the direct cause of a B1911 code. Itâ€™s still worth testing the battery.

10. Do I need to clear the B1911 code after repairs?

Yes, after completing repairs, use an OBDII scanner to clear the code and confirm that it does not return during a test drive.