AutoCodes – Dodge – U0291 Dodge

U0291 Dodge Code - Lost Communication With Gear Shift Control Module 'B'

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to connect automotive devices without a host computer. Common causes include Faulty Gear Shift Control Module 'B', Gear Shift Control Module 'B' harness is open or shorted, Gear Shift Control Module 'B' 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: U0291 Dodge indicates Lost Communication With Gear Shift Control Module 'B'.
Common causes: Common causes include Faulty Gear Shift Control Module 'B', Gear Shift Control Module 'B' harness is open or shorted, Gear Shift Control Module 'B' 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 136

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 Aug 26, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0291 Dodge Description

A Controller Area Network (CAN) is a vehicle bus standard designed to connect automotive devices without a host computer. Operating information and commands are exchanged among the devices, which are programmed to know which messages need to be exchanged over the serial data circuits. The CAN bus uses two dedicated wires for communication, known as CAN high and CAN low. In idle mode, both lines carry 2.5V. During data transmission, the CAN high line rises to 3.75V and the CAN low drops to 1.25V, creating a 2.5V differential between the lines. Since communication depends on this voltage differential, the CAN bus is not sensitive to inductive spikes, electrical fields, or other forms of noise. A Diagnostic Trouble Code (DTC) is set when a periodic message from the Gear Shift Control Module 'B' is not received.

OBDII Code U0291 Dodge - Lost Communication With Gear Shift Control Module 'B' - AutoCodes.com — U0291 Dodge Code - Lost Communication With Gear Shift Control Module 'B'

What does this mean?

What are the Possible Causes of the DTC U0291 Dodge?

Faulty Gear Shift Control Module 'B'
Gear Shift Control Module 'B' harness is open or shorted
Gear Shift Control Module 'B' circuit poor electrical connection

How to Fix the DTC U0291 Dodge?

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 U0291 Dodge 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 U0291 Dodge Code

1. What does the OBDII code U0291 mean in a Dodge vehicle?

It indicates a loss of communication between the Gear Shift Control Module 'B' and other control modules in the vehicle.

2. What are the common symptoms of the U0291 code in Dodge vehicles?

Symptoms may include the inability to shift gears, the transmission stuck in one gear, warning lights on the dashboard, or erratic gear shifting.

3. What causes the U0291 code to appear?

Common causes include a faulty Gear Shift Control Module, damaged wiring or connectors, low battery voltage, or issues with the CAN bus communication network.

4. Can a weak battery cause the U0291 code in Dodge vehicles?

Yes, a weak or failing battery can disrupt communication between modules, potentially triggering the U0291 code.

5. How do you diagnose the U0291 code in a Dodge vehicle?

Diagnosis typically involves scanning for additional codes, inspecting wiring and connectors, and testing the Gear Shift Control Module for faults.

6. Can driving with the U0291 code cause further damage to a Dodge vehicle?

Yes, driving with this code could lead to transmission issues or unsafe driving conditions, and itâ€™s recommended to address the problem promptly.

7. How do you fix the U0291 code in a Dodge vehicle?

Repairs may involve replacing the Gear Shift Control Module, repairing damaged wiring or connectors, or resetting the system with a diagnostic tool.

8. Is the U0291 code specific to Dodge vehicles?

No, the U0291 code can appear in various vehicle makes and models, but its interpretation and common fixes may vary by manufacturer.

9. Can a software update resolve the U0291 code in Dodge vehicles?

In some cases, a software update for the affected control module may resolve communication issues and clear the code.

10. How much does it cost to fix the U0291 code in Dodge vehicles?

Costs vary depending on the cause, but repairs can range from $100 for minor wiring fixes to $500 or more if the Gear Shift Control Module needs replacement.