AutoCodes – Jeep – U1102 Jeep

U1102 Jeep Code - Invalid Or Missing Data For Primary Id

Quick Answer

This is a manufacturer specific fault code and can be used for several different faults, depending upon what the manufacturer wants to use it for. Common causes include Faulty / intermittent ignition switch connections, J1850 / SCP / CAN Bus wiring intermittently open, shorted to power or ground, Faulty / intermittent connection at the Powertrain Control Module (PCM). 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: U1102 Jeep indicates Invalid Or Missing Data For Primary Id.
Common causes: Common causes include Faulty / intermittent ignition switch connections, J1850 / SCP / CAN Bus wiring intermittently open, shorted to power or ground, Faulty / intermittent connection at the Powertrain Control Module (PCM).
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 2,957

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 Apr 22, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1102 Jeep Description

This is a manufacturer specific fault code and can be used for several different faults, depending upon what the manufacturer wants to use it for. Controllers communicate over the Serial Communication Protocol (SCP) bus network, also known as J1850 bus, or Controller Area Network or CAN Bus. These bus communication systems may or may not be fault tolerant, which means any type of intermittent/loose connection between these controllers could cause communication to stop. When these controllers are unable to communicate with each other at any time while the ignition switch is turned on, code U1102 will set.

OBDII Code U1102 Jeep - Invalid Or Missing Data For Primary Id - AutoCodes.com — U1102 Jeep Code - Invalid Or Missing Data For Primary Id

What does this mean?

What are the Possible Causes of the DTC U1102 Jeep?

Faulty / intermittent ignition switch connections
J1850 / SCP / CAN Bus wiring intermittently open, shorted to power or ground
Faulty / intermittent connection at the Powertrain Control Module (PCM)
Faulty / intermittent connection at the Body Control Module (BCM)
Faulty / intermittent connection at the Instrument Panel Cluster (IPC)

How to Fix the DTC U1102 Jeep?

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 does this mean?

Code Tech Notes

This is typically an electrical wiring connection issue at one of the controllers being monitored by the manufacturer.
It can occur if:
Someone changes a battery while the ignition switch is left on, that is, left in the RUN position.
Someone flashes/upgrades their engine controller - other modules unable to communicate with PCM during this process - this will set U1102 at a multitude of controllers on the vehicle - all false codes. Erase and carry on.
May need to disconnect both battery cables and touch them together for 15 seconds. Reattach battery cables, positive first, then negative and see if a soft reset helps.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1102 Jeep 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 U1102 Jeep Code

What does the OBDII code U1102 mean for my Jeep?

The U1102 code indicates that there is invalid or missing data for the primary identifier in the communication between control modules in your vehicle.

What are common symptoms of the U1102 code?

Common symptoms may include the Check Engine Light being illuminated, potential communication issues between control modules, or erratic vehicle behavior such as stalling or misfiring.

What can cause the U1102 code to trigger?

The U1102 code can be triggered by issues such as faulty wiring or connectors, a malfunctioning control module, or problems with the vehicle's communication network.

How can I diagnose the U1102 code?

To diagnose the U1102 code, use an OBDII scanner to confirm the code and check for other related codes. Inspect the wiring and connectors for damage, and test the control modules for proper functionality.

What should I check first if I see the U1102 code?

Start by inspecting the vehicleâ€™s wiring and connectors associated with the control modules, as loose or corroded connections are often the root cause.

Can I drive my Jeep with a U1102 code?

While you may be able to drive your vehicle, it is not recommended, as the underlying issue could lead to more severe problems or unsafe driving conditions.

What are some repair options for the U1102 code?

Repair options may include fixing or replacing damaged wiring or connectors, reprogramming or replacing faulty control modules, and ensuring all relevant software is up to date.

Will clearing the code fix the problem?

Clearing the code may temporarily turn off the Check Engine Light, but if the underlying issue is not resolved, the code is likely to return.

How much will it cost to fix the U1102 code?

Repair costs can vary widely depending on the cause of the issue, ranging from simple wiring repairs to more complex control module replacements, potentially costing anywhere from $100 to $1,000 or more.

Is the U1102 code specific to certain Jeep models?

The U1102 code can occur in various Jeep models, particularly those that utilize OBDII systems, but the exact symptoms and issues may vary by model and year.