AutoCodes – Saab – P2138 Saab

P2138 Saab Code - Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

Quick Answer

This fault code is stored in the Engine Control Module (ECM) when a fault is detected with the circuit monitoring throttle and accelerator pedal position. Common causes include Faulty Throttle/Pedal Position Sensor/Switch, Throttle/Pedal Position Sensor/Switch harness is open or shorted, Throttle/Pedal Position Sensor/Switch 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: P2138 Saab indicates Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.
Common causes: Common causes include Faulty Throttle/Pedal Position Sensor/Switch, Throttle/Pedal Position Sensor/Switch harness is open or shorted, Throttle/Pedal Position Sensor/Switch 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 2,245

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 25, 2021

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2138 Saab Description

This fault code is stored in the Engine Control Module (ECM) when a fault is detected with the circuit monitoring throttle and accelerator pedal position. Both circuits are closely monitored for plausibility checks. The ECM can easily identify erroneous data by monitoring both circuits for inconsistency between the throttle position sensor voltage and the accelerator pedal position sensor voltage. Normally potentiometers are used for both sensor circuits, however, some manufacturers may use a hall effect sensor with a varying frequency depending on the position. Another feature of modern vehicles is using multiple sensors for redundancy and fault analysis. This is where a technician would see data for accelerator pedal position sensor 1 and 2 or throttle position sensor 1 and 2. The voltages from these components can be inversely proportional or a stepped waveform with only output half the output of the other.

OBDII Code P2138 Saab - Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation - AutoCodes.com — P2138 Saab Code - Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

What does this mean?

What are the Possible Causes of the DTC P2138 Saab?

Faulty Throttle/Pedal Position Sensor/Switch
Throttle/Pedal Position Sensor/Switch harness is open or shorted
Throttle/Pedal Position Sensor/Switch circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2138 Saab?

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 P2138 Saab 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 P2138 Saab Code

1. What are the common symptoms of OBDII code P2138 in a Saab related to the Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation?

- Common symptoms include reduced engine power, hesitation or stalling when accelerating, and illuminated check engine light.

2. What are the possible causes of OBDII code P2138 in a Saab?

- The code P2138 in a Saab is typically caused by a faulty throttle position sensor, pedal position sensor, wiring issues, or a problem with the electronic throttle control system.

3. How can I diagnose the Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation issue in my Saab?

- Diagnosing P2138 involves using a scan tool to retrieve the trouble codes, checking the throttle and pedal position sensor voltages, and inspecting the wiring for any signs of damage or corrosion.

4. Can I drive my Saab with OBDII code P2138?

- It is not recommended to drive your Saab with code P2138 as it can lead to unsafe driving conditions and potential engine damage. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I repair OBDII code P2138 in my Saab?

- Repairing P2138 may involve replacing the faulty throttle position sensor, pedal position sensor, or repairing any damaged wiring. It is advisable to consult a professional mechanic for accurate diagnosis and repair.

6. Are there any preventive maintenance tips to avoid OBDII code P2138 in my Saab?

- To prevent code P2138, it is important to regularly inspect and maintain the throttle and pedal position sensors, as well as the electronic throttle control system. Keeping up with routine maintenance can help prevent this issue.

7. Is OBDII code P2138 a common problem in Saab vehicles?

- While not extremely common, OBDII code P2138 related to the Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation can occur in Saab vehicles, especially in older models or vehicles with high mileage.

8. Can a DIY enthusiast fix OBDII code P2138 in a Saab?

- While some DIY enthusiasts may have the skills to diagnose and repair code P2138, it is recommended to seek professional help for accurate diagnosis and proper repair to ensure the issue is resolved effectively.

9. Will resetting the check engine light resolve OBDII code P2138 in my Saab?

- Simply resetting the check engine light will not fix the underlying issue causing code P2138. It is important to diagnose the problem, address the root cause, and clear the code properly to prevent it from reoccurring.

10. How much does it typically cost to repair OBDII code P2138 in a Saab?

- The cost of repairing code P2138 in a Saab can vary depending on the specific cause of the issue, the parts needed for repair, and labor costs. It is advisable to obtain quotes from different mechanics or repair shops for an accurate estimate.