1230 code(s) in this category. Page 6 of 52. Select one to see the detailed diagnosis.
Red (U)
A control module that expects to talk to the engine ECU has stopped receiving messages. Most commonly seen by …
The ECU has lost CAN communication with the alternative fuel control module (CNG/LPG/H2 systems). Either the m…
ECU has lost CAN communication with the EGR control module A. A communication loss with this module breaks any…
ECU has lost CAN communication with the EGR control module B. A communication loss with this module breaks any…
ECU has lost CAN communication with the turbocharger control module A. Boost control tracks commanded vs. actu…
ECU has lost CAN communication with the turbocharger control module B. Boost control tracks commanded vs. actu…
ECU lost CAN communication with the AdBlue/SCR reductant control module. Emissions affected. A communication l…
ECU lost CAN communication with the A/C control module. Climate functions degraded. A communication loss with …
ECU lost CAN communication with exhaust gas sensor module A (often integrates wide-range O2/NOx sensors).…
ECU lost CAN communication with rocker arm control module A (variable valve actuation). A communication loss w…