What Does P2138 Code Means on Chevy Malibu and How to Fix
The throttle position sensor’s D and/or E circuits have malfunctioned, according to the Engine Control Module, according to the P2138 OBD II error code.
Once you have the code, you might not be certain exactly how to correct it. So, no need to worry! In this article, we’ll go over the code P2138 in detail and demonstrate how to easily fix it.
What Does P2138 Code Means on Chevy malibu?
The diagnostic trouble code P2138 on the Chevrolet Malibu and other OBD-II-equipped vehicles denotes a throttle position sensor problem.
The actual code will read “Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation,” which essentially means that the engine control module (ECM) has discovered problems in the D and/or E circuits of the TPS.
It’s conceivable that you will have stopping, starting issues, or poor acceleration if you see the code. The throttle position sensor failing is the most likely but not the only cause of the DTC, so be aware that replacing it could not solve your problem.
If your diagnosis indicates that you need to do so, you could also need to replace the wiring, the throttle body component, or possibly the entire engine control module.
When we get to the answer later in this post, we’ll tell you more about this code and its causes. Here is how to code P2138 is broken down:
- P: Powertrain. It includes the engine, transmission, and all the associated accessories.
- 2: the code is a standardized (SAE) code; also known as generic code
- 1: Fuel and Air Metering
- 38: Throttle/Pedal Position Sensor/Switch “D”/”E” Voltage Correlation
How Serious Is Code P2138 of Chevy Malibu?
The P2138 error code is quite serious. The vehicle’s throttle response may be lost as a result of this issue code. This could cause a wreck if it occurs at the wrong time. The only recommendation is for immediate repair.
Having stated that, it is not advised for anyone who has a P2138 trouble code recorded to have the problem fixed right away.
What Causes Code P2138 on Chevy Malibu?
There are a few indications the Chevy Malibu may exhibit if the Code P2138 means.
One of the first causes of the P2138 code is a defective ECM., on average. P2138 causes may also consist of:
- An outdated, damaged, or filthy APP or TP sensor
- APP or TP sensor connector that is damaged, defective, loose, or unconnected
- TP or APP sensor wiring or circuits that are faulty or defective
- Incorrect dielectric grease applied to the connector for the APP or TP sensor
- Broken wiring
- Insufficient electrical connections
- Computer problem
Other Symptoms of Getting P2138 on Chevy Malibu
The symptoms are frequently so subtle that you frequently wouldn’t notice them all at once. However, in some instances, you may see the following signs of this code:
The longer you wait to check your engine after receiving the code, the more likely these following severe symptoms may be.
- A rapid decrease of power at cruising speeds may be the first sign of the P2138 code.
- It’s possible for your car to have issues with acceleration, power loss, and engine responsiveness.
- Peculiar “pedal feel”
- Engine revving without using the throttle
- Stalled engine
- Limp mode
- When the code is configured to indicate there is a problem, the Check Engine Light will also come on.
- At any RPM, you might discover that the throttle sticks and won’t move.
How is the P2138 code Diagnosed of a Chevy Malibu?
The four primary causes of P2138 are problems with the throttle position sensor, the accelerator pedal position sensor, the wiring, or the PCM. The PCM issue is frequently the least likely of these problems because your car’s engine has a TSB.
Check the Wiring using a Multimeter
Check the voltage flowing from the D and E throttle position sensors, as well as the accelerator position sensor, on your Chevy Malibu to make sure it complies with the manufacturer’s requirements. You must swap out the faulty sensor if they are out of range.
Check the Wiring for Shorts and Opens
A wiring open or short is a common source of P2138. Check to see that the pigtails that connect to the throttle position sensor are not harmed in any way.
PCM Concerns
Although it’s not the best place to begin. Some automobiles’ PCM reflashes can fix P2138. If your Malibu’s model year and engine are relevant, you can search NHTSA to see if there are any technical service bulletins. However, it would probably be quicker to simply call the service department at the nearby Chevy store.
How Hard Is It to Check a P2138 Code?
The inspection procedure should be carried out by a technician with knowledge of P2138 issues because it calls for numerous steps and involves complex systems including the throttle body assembly and throttle position sensors.
However, it is not advised to attempt a do-it-yourself repair of this problem at home since you risk further harming your engine.
How To Fix the P2138 Code on Chevy Malibu?
1. Search for More dtcs
Make careful to check for any additional stored Diagnostic Trouble Codes before beginning your diagnostic efforts. Before going on to code P2138, all other further codes must be diagnosed and thoroughly resolved.
2. Inspect for tsbs
Several technical service bulletins, outlining fixes for the P2138 error code, have been provided by automakers. This is especially accurate for many Chevrolet SUVs and trucks. those who previously displayed negative symptoms of an accelerator pedal position sensor failure.
3. Examine the Throttle Body Visually
Look for any symptoms of pinched or torn wires in the vehicle’s throttle wiring or body. At any end of the throttle body connector, look for any pin damage. Look for any harm that has been done to the throttle body housing.
4. Learn to Switch the Body and Test
If you found no visual flaws in the previous step, proceed to the throttle body retraining procedure.
Vehicles must follow this method. Therefore, for this one, you must consult the manufacturer-specific service manual. Trucks, automobiles, and SUVs all use a different technique. When you’re done, test drive your automobile to check whether code P2138 reappears.
5. Check Voltage sweep at the Accelerator Pedal
If the error number P2138 reappears, examine the accelerator pedal on the impacted vehicle with a multimeter.
The car part needs to have its back examined. Between the sensor’s signal circuit and the sensor’s ground, you should measure the voltage.
The signal voltage needs to be able to fluctuate smoothly between 0.5v and 5.0v when the car’s key is in the “On” position. That is because the accelerator pedal gradually depressed. If the readings are excessively irregular, the sensor must be changed.
6. Check Power at the Troubled Motor
The power wire of the motor should then be back probed. It settles inside the connector for the wiring of the throttle body.
While keeping the ignition “On,” ask a friend or member of your family to lightly touch the accelerator pedal. An issue with the throttle body would be indicated by a voltage function. The PCM/ECM has malfunctioned if there is no voltage reading. Additionally, the related signal unit could be in an “open” state.
How Much Does It Cost to Fix the Chevy Malibu P2138 Code?
The following fixes for error code P2138 can be required depending on the root of the problem. The estimated cost of repair for each potential fix includes the price of the necessary components as well as the cost of the labor needed to complete the fix.
- $570 to $700 for the throttle body actuator
- $170–$230 for a throttle position sensor
- $130–$200 for accelerator pedal position sensor
- $100-$1000 for replacing or repairing the wiring
Can You Drive if You Have a P2138 Code?
Driving while having the P2138 code is not advised by qualified mechanics since it may make it more difficult for you to regulate your car’s acceleration.
On the road, this is extremely risky and may even result in potential collisions that harm both your car and other vehicles.
Because of this, whenever you encounter the P2138 error code, you ought to take your car to a licensed service center right away.The longer you leave it alone, the more likely it is that you may have decreased fuel efficiency and more serious overall engine issues.
Frequently Asked Questions (FAQs)
Can I repair the P2138 engine code by myself?
While repairing engine code P2138 on your own is doable, it isn’t advised unless you have extensive expertise and experience with car maintenance. You don’t want to risk further harm to your car by attempting the inspection and repairs, which can be complex.
Can a Throttle Position Sensor Be Broken and Still Drive?
Technically, a malfunctioning throttle position sensor won’t stop you from driving. However, keep in mind that a malfunctioning throttle position sensor can result in a lack of power when accelerating, an inability to shift up, and a harsh or slow idle.
What equipment is required to diagnose the code P2138?
FIXD, simple hand tools, a service manual for a specific vehicle, and multimeter are needed to fix this code.
Conclusion
P2138 is a crucial code that can be challenging to correctly diagnose. Driving with a computer-controlled throttle that is unsure of how much gas to give your car is not safe. Good luck with your Malibu repairs!
