AutoCodes – Cadillac – P0251 Cadillac

P0251 Cadillac Code - Injection Pump Cam Sensor Circuit

Quick Answer

The optical sensor provides a pump cam signal to Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. Common causes include Faulty Injection Pump, Injection Pump harness is open or shorted, Injection Pump 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: P0251 Cadillac indicates Injection Pump Cam Sensor Circuit.
Common causes: Common causes include Faulty Injection Pump, Injection Pump harness is open or shorted, Injection Pump 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 372

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 21, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0251 Cadillac Description

The optical sensor provides a pump cam signal to Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. The pump cam is an important input by PCM for fuel control and timing. The test monitors the number of crankshaft position pulses that have occurred since the last cam pulse. Physical one-to-one correspondence between pump cam and crankshaft implies that if more crank pulses are detected than cam pulses, the cam pulses have been missing. The Diagnostic Trouble Code (DTC) will set when 8 consecutive cam pulses are missing, or an average of 8 cam pulses are missing.

OBDII Code P0251 Cadillac - Injection Pump Cam Sensor Circuit - AutoCodes.com — P0251 Cadillac Code - Injection Pump Cam Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P0251 Cadillac?

Faulty Injection Pump
Injection Pump harness is open or shorted
Injection Pump circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0251 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 P0251 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 P0251 Cadillac Code

1. What are the common symptoms of OBDII code P0251 in a Cadillac related to the Injection Pump Cam Sensor Circuit?

The common symptoms include hard starting, rough idling, engine stalling, and a decrease in engine performance.

2. What are the potential causes of the P0251 code in a Cadillac?

The code P0251 in a Cadillac can be caused by a faulty injection pump cam sensor, wiring issues, poor electrical connections, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the P0251 code in my Cadillac?

Diagnosing the P0251 code involves checking the injection pump cam sensor and its wiring for any visible damage, testing the sensor's resistance, and using a scan tool to gather data from the ECM.

4. Can I continue driving my Cadillac with the P0251 code present?

It is not recommended to continue driving your Cadillac with the P0251 code active, as it can lead to further engine damage and potentially unsafe driving conditions.

5. How can I repair the P0251 code in my Cadillac?

To repair the P0251 code, you may need to replace the faulty injection pump cam sensor, repair any damaged wiring or connections, and clear the code using a scan tool.

6. Will resetting the code make it go away permanently?

Resetting the code may clear it temporarily, but if the underlying issue causing the P0251 code is not addressed, the code is likely to reappear.

7. Is it possible to prevent the P0251 code from occurring in the future?

Regular maintenance and timely repairs of the injection pump cam sensor and related components can help prevent the recurrence of the P0251 code in your Cadillac.

8. Can a DIY enthusiast repair the P0251 code at home?

While some DIY enthusiasts may have the skills to diagnose and repair the P0251 code, it is recommended to seek professional help to ensure the problem is properly addressed.

9. How long does it typically take to repair the P0251 code in a Cadillac?

The repair time for the P0251 code can vary depending on the exact cause of the issue, but it may take a few hours to a full day to diagnose and fix the problem.

10. Are there any recalls or technical service bulletins related to the P0251 code in Cadillac vehicles?

It's recommended to check with a Cadillac dealership or online resources to see if there are any relevant recalls or technical service bulletins addressing the P0251 code in your specific Cadillac model.