AutoCodes – Cadillac – P133C Cadillac

P133C Cadillac Code - Cylinder 5 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The Glow Plug Control Module has not learned the glow plug offset values. Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 5, Glow Plug 5 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: P133C Cadillac indicates Cylinder 5 Glow Plug Offset Exceeded Learning Limit.
Common causes: Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 5, Glow Plug 5 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 453

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 Sep 30, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P133C Cadillac Description

The Glow Plug Control Module has not learned the glow plug offset values. If a glow plug has been replaced and the glow plug learn was not performed, or if the Glow Plug Control Module experiences an Electronically Erasable Programmable Read Only Memory (EEPROM) error or data corruption, this Diagnostic Trouble Code (DTC) to set. The DTC will be set if the glow plug hot resistance is outside a predefined threshold.

OBDII Code P133C Cadillac - Cylinder 5 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P133C Cadillac Code - Cylinder 5 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P133C Cadillac?

Perform Glow Plug Learn procedure
Faulty Glow Plug 5
Glow Plug 5 harness is open or shorted
Glow Plug 5 circuit poor electrical connection

How to Fix the DTC P133C 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 does this mean?

Code Tech Notes

If a Glow Plug was replaced, perform a Glow Plug Learn procedure with a Scan Tool.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P133C 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 P133C Cadillac Code

What does the OBDII code P133C mean for my Cadillac?

The P133C code indicates that the glow plug offset for cylinder 5 has exceeded the learning limit, which can affect the engine's ability to start properly in cold conditions.

What are the common symptoms associated with the P133C code?

Common symptoms include difficulty starting the engine, especially in cold weather, rough idling, decreased engine performance, and possible increased exhaust emissions.

What could cause the P133C code to trigger?

Causes may include a faulty glow plug, a malfunctioning glow plug control module, issues with the wiring or connectors related to the glow plug, or problems with the engine control unit (ECU).

How can I diagnose the P133C code?

Start by checking for any additional trouble codes, inspect the glow plug and its wiring for damage, test the glow plug's resistance, and verify that the glow plug control module is functioning correctly.

What are some repair tips for fixing the P133C code?

Repairs may involve replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, resetting the ECU, or, if necessary, replacing the glow plug control module.

Can I drive my Cadillac with the P133C code?

While you can drive the vehicle, it may exhibit poor starting performance and could lead to further engine issues. It's recommended to address the problem as soon as possible.

Will clearing the P133C code fix the problem?

Clearing the code may temporarily turn off the check engine light, but it won't fix the underlying issue. The code will likely return if the problem is not resolved.

How can I prevent the P133C code from reoccurring?

Regular maintenance, including checking and replacing glow plugs as needed, can help prevent this code from reoccurring. Additionally, ensure all connections are clean and secure.

Is it safe to ignore the P133C code?

Ignoring the P133C code is not advisable, as it may lead to starting issues and could affect the performance and reliability of your vehicle, especially in cold weather conditions.