Guide To P0703 OBD Error Code Solutions

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Anxious about the OBD error code flashing? Well, with Parts Avatar everything is easy. Here’s how you can simply apprehend the OBD error code. A P0703 code signals at the fault registered in the brake switch B circuit by the PCM. This is the dedicated stop lamp circuit that is responsible for deactivating the cruise control system and transmission torque converter lockup system also disabling the stop lamps.

When the PCM records a voltage or a resistance reading from the brake lamp circuit that fails to match the desired reading, driving a hard code and an illuminated malfunction indicator lamp (MIL), the code P0703 sets in. The ABS controller is responsible for transmitting the brake lamp voltage information on. It does that sometimes through the CAN bus system to transfer data between the individual modules installed. This code P0703 is stored when the transmission control system (mostly in the PCM) registers an abnormal reading on the brake lamp voltage and resistance.

What causes this problem with the Torque Converter/Brake Switch B Circuit Malfunction?

• A distorted brake switch
• A brake switch fitted wrongly
• Short circuited or open wiring and/or connectors in the brake switch circuit assigned as B
• Corroded fuses or blown fusible link
• A malfunctioning PCM or PCM programming error

1. Brake Switch - An erroneous brake switch can always be troublesome. So, in order to combat the error code P0703 it is essential to replace or restore the brake switch. What are you waiting for? We are just a click away!
2. Powertrain Control Module - Abbreviated PCM; this is an integral control unit. So, a defective one should be changed instantly.
3. Connectors - Facing the Error P0703? Well, get that fixed with a new connector available at Parts Avatar online at the best prices.
4. Fuse - Weary and blown out fuses can often be problematic. So, to add some spark to your ride you definitely need the perfect quality fuses that offered at Parts Avatar. Isn’t that just the perfect deal?
5. Malfunction Indicator Lamp - Stressed about your defective malfunction indicator lamp? Well, not anymore! We have got you covered. Tune into Parts Avatar for premium quality malfunction indicator lamps now.
6. Exhaust Pressure Sensor - Having problems with the exhaust pressure sensor? Don’t you worry, Parts Avatar has it all. A faulty exhaust pressure Sensor could end up being the root cause behind the Error code P0703.
7. Exhaust Pressure Control Valve - A distorted exhaust pressure control valve can end up being the chief host inviting the Error Code P0703. So, replacing one can be one of the wisest decisions to avoid a problematic system.
8. Automatic Transmission Module - Hate the halts as much as we do? Well, an unsound automatic transmission module can be hazardous for the system. Get yours changed now in order to accurately combat the error code P0703.

Curious to know the symptoms to OBD code P0703? If yes, then you have arrived at the right destination. We at Parts Avatar have listed out few common symptoms associated with Torque Converter/Brake Switch B Circuit Malfunction.

Common Symptoms

• Dysfunctional brake lamps
• Brake lamps that constantly have their light illuminated
• A possible failure in the torque converter to lock up
• Regular halts while stopped and in gear, due to a failure of the torque converter lockup to disengage
• Other various stored trouble codes
• An Illuminated MIL
• Numerous other codes related to torque converter, torque converter clutch or torque converter lockup

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Here’s how you can correct your OBD error code P0703:

• The stop lamp switch should be carefully repaired, adjusted and reinstituted
• Examine brake light switch, circuit, and fuses
• Clear away and change the brake light switch if it is not working
• Substitute the fuse if it is damaged
• Inspect operation of the brake lights
• Confirm if the vehicle can be shifted from park to drive

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You should perform the following steps in order to diagnose this P0703 fault code:

For most vehicles which are equipped with OBD-II, the torque converter clutch and cruise control, and engaging brake lamp illumination are shut down because of the stop lamp switch. Most stop lamp switches are of the on/off variety and are vaulted on the brake pedal support bracket. Designs can come in a great variety – some models have the switch mounted on the pedal lever itself, and use the lever pivot point as the fulcrum to move contacts, opening and closing the circuit.

In any design, the constant voltage is present on one side of the switch; voltage moves across the switch’s contacts and on to another application when the switch’s contacts are closed. You should start your diagnosis with a visual examination of all wiring and connectors. You need to Repair/substitute any damaged, disconnected, defective, shorted or corroded wiring, connectors or elements as required. Retest the system after you have made the desired repairs.

A manufacturer’s wiring schematic, OBD-II scanner or code reader and a digital volt/ohmmeter will be required for any further investigation. Inspect the PCM wiring and connectors and make any necessary repairs in any damaged, disconnected, shorted or corroded wiring, connectors or elements as needed. test the system again. If all wiring and components are in good working order, the code reader will have to be connected to the diagnostic port and any stored codes to be recorded. The next step is to clear the codes and test drive the vehicle to check if the code registers again.

In case the code doesn’t register again, there may be a problem of having an intermittent condition which might need to be allowed to become worse before a correct analysis and necessary repairs can be made. If the code registers again immediately:

• inspect battery voltage on the stop lamp switch input side, using the help of the volt/ohmmeter
• If there is no voltage found on the input side, any related control modules should be disconnected and continuity between the system fuse and stop lamp switch input circuit need to be checked for. reconstruct open or shorted circuits as required.
• If on checking it is found that voltage is present on the stop lamp switch output side, check for voltage on the output side with the brake pedal depressed.
• If you find voltage only on the input side but not on the output side (with brake pedal depressed), the defect may be a failed or badly adjusted stop lamp switch. Most stop lamp switches are adjustable – retest the system after making the necessary adjustments or replacements.
• If voltage is present on both the input and output sides of the stop lamp switch, with the brake pedal depressed, check whether the brake lamps are working properly. If this fails, test the turn signal switch for battery voltage while brake pedal is depressed. The input and output sides of the turn signal switch should be verified.it is recommended to refer to a factory wiring diagram for accurate wiring colour and location.
• If all of it is checked, one should proceed further to the voltage present at output circuit of the stop lamp switch and turn signal switch, and see the brake lamps if working in order. The circuit continuity and resistance between the stop lamp switch and PCM should be examined and checked. Ensure checking all circuits utilizing vehicle wiring diagram. The short-circuited connectors should be replaced too.
• If no other issues come forth, a defective PCM should be suspected. However, one should remember that a failed PCM is rare and will require reprogramming for a complete replacement.

Common Mistakes When Diagnosing the P0703 Code

Anxious about a misdiagnose? Well, we have listed here a few common mistakes that should be avoided while diagnosing the code P0703:

While a problem related to stop lamp switch can often seem to be simple, it can be accompanied by other codes that can lead a mechanic to troubleshoot the torque converter clutch lockup solenoid or wiring.