Share
Ask OBDII Question

20,184 questions

10,238 answers

626 comments

7,263 users

Top Users

Reynaldo (3815 Points)
G37driver (2905 Points)
OBDIITech (2389 Points)
milonajo1 (737 Points)
OBDtech2 (165 Points)
corvette-78 (127 Points)
knowledge 1488 (124 Points)
Samat Bekov (117 Points)
ptl (113 Points)
sabtele (112 Points)

what can cause an error code C1203?

The engine light turned on and that was the error after picking it up from a dealership.

Vehicle: 2003 toyota sequoia v8
asked Aug 19, 2013 by anonymous

1 Answer

C1203 ECM communication circuit malfunction

What should be check first is brake fluid level,a low brake fluid level switch can set this code ,the TRAC and VSC use this information for the skid control module, If the fluid is full you have a open circuit in the harness between the ECM to the skid control ECU.
answered Aug 20, 2013 by Reynaldo (3,815 points)

Related questions

1 answer
118 views asked Nov 13, 2013 by kamssu
1 answer
146 views asked Nov 6, 2013 by anonymous
...