Code C1237?

Tiny
BRIAN LANDRY
  • MEMBER
  • 2016 TOYOTA CAMRY
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 160,287 MILES
So after I rotated my tires my car started malfunctioning. Somehow jacking it up triggered it. When I drove it after I was done with the tire rotation my traction control would kick in at approximately 20 mph and would be in low power mode. If I manually turned off traction control it would drive normally but would turn back on if I would come to a complete stop and go again. It’s not showing a check engine light either. I hooked up a scanner tool and got a c1237 error code. Says Speed sensor rotor faulty.
Sunday, January 12th, 2025 AT 8:13 PM

9 Replies

Tiny
AL514
  • MECHANIC
  • 4,979 POSTS
Hello, are all the tires on the vehicle the same size? And when jacking it up, I would check the locations where the jack or jack stands were. This is a speed sensor code, so there may have been some wires either damaged or the harness was pulled in some location, check to make sure all the wheel speed sensors are still plugged in at each wheel, you should be able to see the connectors easily. Since there was no fault codes before the rotation, I would think the tires are all the same and the wear on them is roughly the same, if it was one tire that the speed sensor signal was faulty on, there would be a code for that specific tire, but this a speed signal that's not correct, so start with checking all the wiring, also verify there is a speed indicated on the instrument cluster.
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Monday, January 13th, 2025 AT 10:18 AM
Tiny
AL514
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After checking all the connectors at each wheel and making sure there is no wiring harness damage, clear the code, turn the key off, then go for another test drive, see if the code comes back, Wire damage should be easy to spot since you know exactly where the jack and stands were positioned. Look for places where the harness in general could have been crushed.
Once you clear the codes, drive it at least 28 MPH for over 2 minutes.
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Monday, January 13th, 2025 AT 10:24 AM
Tiny
BRIAN LANDRY
  • MEMBER
  • 6 POSTS
Okay. I will let you know what I find out. Thank you for the help.
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Monday, January 13th, 2025 AT 11:13 AM
Tiny
BRIAN LANDRY
  • MEMBER
  • 6 POSTS
It also had a c1201 code as well. Engine control system malfunction. Would that be triggered due to the prior code?
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Monday, January 13th, 2025 AT 11:17 AM
Tiny
AL514
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This code is most likely going to be set because there is an issue with the vehicle speed being read incorrectly, Vehicle speed is a very important data PID for engine and transmission data, shift points, fuel injector cutoff (or decel), etc. So, concentrate on checking the wiring at each wheel speed sensor and just look in the areas where you were working. I know it can be difficult sometimes to tell where to jack a vehicle up at, the owner's manual in the glovebox should give some direction as to where the lift points are when changing a tire, that's just something that happens to everyone eventually. But the manual can be helpful with that kind of information.
Once you find the issue and clear the codes out, things with other systems should clear up.
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Monday, January 13th, 2025 AT 12:02 PM
Tiny
AL514
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Sorry I meant the vehicle speed being read incorrectly. My fault.
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Monday, January 13th, 2025 AT 12:05 PM
Tiny
BRIAN LANDRY
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So I jacked it up and checked for some damaged wires and couldn’t find anything. I also took off the front two wheels and released the front two speed sensors. They didn’t look bad at all. The rings that they read looked clean as well. So, I used my multimeter and checked the resistance on both. The passenger side front read 1280 ohms, and the driver side front read 1220 ohms. So, I put everything back together and took it for a test drive then things got weird. The speedometer stopped working and the check engine light, ABS, traction control and power steering lights came on. When I got home, I hooked up the obd2 scanner and got more codes. P0500 and c1541 being the newest. I didn’t check the two rear speed sensors connections due to the location of the plug being under the back seats.
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Sunday, January 26th, 2025 AT 11:10 AM
Tiny
BRIAN LANDRY
  • MEMBER
  • 6 POSTS
So I think I have it figured out. Turns out the last time I got new tires they put the wrong size on. I buy them in pairs so my newest 2 are the -65 and the other 2 are the -55. My car calls for the -55 size. Which makes more sense now since this happens when I rotate my tires. It started in December of 2023 and that was the year I purchased 2 new tires. I will update on the final verdict but I'm pretty sure this is what is causing the issues.
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Tuesday, January 28th, 2025 AT 9:30 AM
Tiny
AL514
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Yes that will cause those types of codes to set, the tires all need to be the same size, or they will register slightly different speeds. With all the same size, you can clear the codes and should be all set. Even without clearing the codes, if the fault is resolved the traction light shouldn't come back on.
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Tuesday, January 28th, 2025 AT 9:53 AM

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