C1235 At 75 mph
Thread Starter
Intermediate
Joined: Dec 2010
Posts: 35
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From: Cypress Texas
C1235 At 75 mph
I keep getting this code for the right rear speed sensor C1235, and need a little help to get fixed. Does anyone know a part number for the wiring harness, and maybe also know where I can get it? 
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
C1235 RR Wheel Speed Circuit Open or Shorted
you may want to pull these checks first:
C1235 indicates the RR (passenger side rear right) Wheel Speed Circuit is Open or Shorted . Start by checking the connections. The wheel speed sensor is integrated into the wheel bearing/hub assembly . The wire coming out of the back is the connection for the wheel speed sensor. Verify that the connector is not broken, damaged, or corroded in any way. Pay particular attention to the female end.
The wire coming out of the wheel speed sensor connects to a 18" jumper harness, then to the main harness. It is very common for people to have a weak female pin in one of those connections. If all of that checks out good, swap the jumper harness from side to side. For example, if the right rear one is bad, swap it over to the left rear one. And install the good one from the left to the right
side. Then clear the trouble code. If the trouble code is now on the other side, you know the wire harness is the problem. If the code is still on the right side after swapping the jumper harnesses, you know the problem is inside the right rear wheel speed sensor (replace it).
If all the wires check out good, it's time to take a trip to Auto Zone for a new bearing. You can buy a replacement AC Delco bearing from your dealer if you want to, or get the exact same bearing in a different box for half the price (~$150) from Auto Zone.
C1235 indicates the RR (passenger side rear right) Wheel Speed Circuit is Open or Shorted . Start by checking the connections. The wheel speed sensor is integrated into the wheel bearing/hub assembly . The wire coming out of the back is the connection for the wheel speed sensor. Verify that the connector is not broken, damaged, or corroded in any way. Pay particular attention to the female end.
The wire coming out of the wheel speed sensor connects to a 18" jumper harness, then to the main harness. It is very common for people to have a weak female pin in one of those connections. If all of that checks out good, swap the jumper harness from side to side. For example, if the right rear one is bad, swap it over to the left rear one. And install the good one from the left to the right
side. Then clear the trouble code. If the trouble code is now on the other side, you know the wire harness is the problem. If the code is still on the right side after swapping the jumper harnesses, you know the problem is inside the right rear wheel speed sensor (replace it).
If all the wires check out good, it's time to take a trip to Auto Zone for a new bearing. You can buy a replacement AC Delco bearing from your dealer if you want to, or get the exact same bearing in a different box for half the price (~$150) from Auto Zone.
Last edited by trussme; Feb 16, 2011 at 10:04 AM.
Thread Starter
Intermediate
Joined: Dec 2010
Posts: 35
Likes: 0
From: Cypress Texas
you may want to pull these checks first:
C1235 indicates the RR (passenger side rear right) Wheel Speed Circuit is Open or Shorted . Start by checking the connections. The wheel speed sensor is integrated into the wheel bearing/hub assembly . The wire coming out of the back is the connection for the wheel speed sensor. Verify that the connector is not broken, damaged, or corroded in any way. Pay particular attention to the female end.
The wire coming out of the wheel speed sensor connects to a 18" jumper harness, then to the main harness. It is very common for people to have a weak female pin in one of those connections. If all of that checks out good, swap the jumper harness from side to side. For example, if the right rear one is bad, swap it over to the left rear one. And install the good one from the left to the right
side. Then clear the trouble code. If the trouble code is now on the other side, you know the wire harness is the problem. If the code is still on the right side after swapping the jumper harnesses, you know the problem is inside the right rear wheel speed sensor (replace it).
If all the wires check out good, it's time to take a trip to Auto Zone for a new bearing. You can buy a replacement AC Delco bearing from your dealer if you want to, or get the exact same bearing in a different box for half the price (~$150) from Auto Zone.
C1235 indicates the RR (passenger side rear right) Wheel Speed Circuit is Open or Shorted . Start by checking the connections. The wheel speed sensor is integrated into the wheel bearing/hub assembly . The wire coming out of the back is the connection for the wheel speed sensor. Verify that the connector is not broken, damaged, or corroded in any way. Pay particular attention to the female end.
The wire coming out of the wheel speed sensor connects to a 18" jumper harness, then to the main harness. It is very common for people to have a weak female pin in one of those connections. If all of that checks out good, swap the jumper harness from side to side. For example, if the right rear one is bad, swap it over to the left rear one. And install the good one from the left to the right
side. Then clear the trouble code. If the trouble code is now on the other side, you know the wire harness is the problem. If the code is still on the right side after swapping the jumper harnesses, you know the problem is inside the right rear wheel speed sensor (replace it).
If all the wires check out good, it's time to take a trip to Auto Zone for a new bearing. You can buy a replacement AC Delco bearing from your dealer if you want to, or get the exact same bearing in a different box for half the price (~$150) from Auto Zone.
Doest the EBCTM only send a signal to the sensor at 75mph+? All connections are spotless!
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
The 2ft section of jumper harness that connects to the wheel speed sensor .... Due to suspension travel,over time this harness will get an intermittent open or high resistance in the wiring.The harness was redesigned and left and right jumper harnesses are the same part# 10332527 and easy to replace,about $35.00 each.
Given that,a simple diagnoses would be to swap the jumper harnesses left to right to see if the fault moves to the other side
Wheel speed sensors are commonly misdiagnosed when the fault is simply the jumper harness that goes to the speed sensor
Given that,a simple diagnoses would be to swap the jumper harnesses left to right to see if the fault moves to the other side
Wheel speed sensors are commonly misdiagnosed when the fault is simply the jumper harness that goes to the speed sensor
Last edited by trussme; Feb 16, 2011 at 12:16 PM.
Thread Starter
Intermediate
Joined: Dec 2010
Posts: 35
Likes: 0
From: Cypress Texas
The 2ft section of jumper harness that connects to the wheel speed sensor .... Due to suspension travel,over time this harness will get an intermittent open or high resistance in the wiring.The harness was redesigned and left and right jumper harnesses are the same part# 10332527 and easy to replace,about $35.00 each.
Given that,a simple diagnoses would be to swap the jumper harnesses left to right to see if the fault moves to the other side Wheel speed sensors are commonly misdiagnosed when the fault is simply the jumper harness that goes to the speed sensor
Given that,a simple diagnoses would be to swap the jumper harnesses left to right to see if the fault moves to the other side
Wheel speed sensors are commonly misdiagnosed when the fault is simply the jumper harness that goes to the speed sensorThanks,
Robert
