Guide To P0737 OBD Error Code Solutions

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Are you experiencing irregular acceleration? Improper gear shifts resulting in stalling and jolts? Is there an effect on the fuel consumption patterns of the vehicle? These are a direct indication towards a problematic transmission control system and circuitry, thus causing OBD code P0737 error getting stored in the Powertrain Control Module (PCM) and Check Engine Light getting illuminated.

 

OBD-II Code Transmission may not shift properly is defined as a TCM Engine Speed Output Circuit.

OBD code P0737 flashes when the TCM (transmission control module) or PCM (powertrain control module) receives an engine speed signal from the engine speed output sensor that is either irrational, erratic, or in some way incorrect. Without a usable input speed signal, the transmission cannot provide a proper shift strategy. The TCM or PCM compares input speed data with output speed data to determine shift patterns, as well as certain engine drivability functions.

 

The Engine Speed Sensor tells the Transmission Control Module (TCM) how fast the engine is spinning so the correct gear can be engaged. When the TCM receives an inaccurate signal from this sensor, it can't properly shift the vehicle from gear to gear as the vehicle needs to change speed and rates of acceleration. Most vehicles use the crankshaft position sensor for this information. The engine control module (PCM) or TCM will set code P0737.

 

What causes this problem with the TCM Engine Speed Output Circuit?

 

• Defective engine speed sensor (CKP) crankshaft position sensor
• Defective transmission OSS output speed sensor
• Shorted, open, corroded, or damaged wiring circuits or connectors
• Defective shift solenoid/s
• Defective engine drivability sensors
• Dirty/contaminated transmission fluid that restricts flow, or defective valve body
• Defective Powertrain Control Module

1. Engine Sensor & Switches - It is important to check for all the switched and sensors in relation to the engine that can affect the transmission system and its performance decisions. Buy new switches and sensors now!
2. Crank Position Sensor - Crank position sensor. If faulty can misinterpret the engine speed and thus must be repaired or replaced as required. Buy new crankshaft sensor now!
3. Speed Sensor - Speed sensor are really important for the transmission system to choose which gear to shift into and thus must be replaced. Buy new speed sensor now!
4. Transmission Control Module - Sometimes the module itself can be faulty, causing disruption in performance. Thus, replace faulty modules now!
5. Engine Control Module - OBD Error Code P0737 can be indicated by engine stalling or not starting, and check engine lights being on which can also be due to faulty ECMs. It’s better to get the faulty electricals replaced as soon as possible.
6. Powertrain Control Module - P0737 error code also relates to problems with the powertrain that is not able to generate response in time causing distorted engine timing. Find all the Powertrain related parts with us.
7. Diagnostic Tool - Detect the OBD error code by using professional diagnostic tools. Buy them from us now!

Interested in knowing the symptoms to old code P0737? If yes, then you have arrived at the right place. We at Parts Avatar have listed out few common symptoms associated with TCM Engine Speed Output Circuit

 

Common Symptoms

 

• MIL (Malfunction Indicator Lamp) illumination
• Harsh shift, failure to shift
• Decrease in fuel economy
• Speedometer may fluctuate or fail to operate
• Engine may stall when coming to a stop, engine misfire, sag, stall, or hesitation
• Output speed sensor code also getting stored in PCM

After you know the symptoms of your vehicle’s problem, it becomes easy to detect it and get started with solving it. So, next on our list is few common steps to correct this issue with your vehicle.

 

• Engine speed sensor replacement
• Faulty crankshaft sensor replacement
• Transmission system circuit wiring and connector replacement
• PCM failure that might require repair, reprogramming or replacement
• Faulty Transmission control module replacement

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of Engine Speed Sensor, Engine Control Module, Transmission Control Module, Turbo, oil pressure sensor and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code:

 

• Make use of a digital volt ohm meter (DVOM) for the complete test. Continue through the tests until the problem is confirmed. You will also need a basic OBD code scanner to reset the computer and erase the code.
• Test the Engine Speed Sensor using desired electrical values from the manufacturer. Repair or replace accordingly. Typically speaking, these sensors read the speed of the crankshaft so it would most likely be mounted somewhere on the engine block.
• Make sure to check the automatic transmission fluid. Making sure it is clean and full. Top up as necessary. Low fluid can cause automatic transmissions to do funny things, so keep on it! Black or extremely dark transmission fluid, will need to be replaced to ensure proper transmission function.
• Not only can low and/or dirty transmission fluid cause this code to be activated, but may cause further damage to internal transmission components. Which is one of the most expensive repairs in the business so ensure good clean fluid is present.
• Inspect for any damage to the harness. There may be chafing occurring if the harness is routed close to the engine and other sharp components. Repair and damaged wiring and circuit parts.
• Check for TCM faults and failures and replace or repair as required. Also check the PCM for error and in rare cases, it can itself be faulty.

Common Mistakes When Diagnosing the P0737 Code

 

The most frequently made error when diagnosing this code comes from failing to correctly follow the OBD-II trouble code diagnosis protocol. It’s important for mechanics to follow the protocol step by step, as this guarantees an efficient and thorough diagnosis.

 

• Crankshaft Position Sensor (CKP) failure
• Powertrain Control Module (PCM) failure
• Transmission Control Module (TCM) failure
• Wiring and connector issue