Check Honda Aftermarket and LED Bulbs

Some 2014-2020 Toyota 4Runner vehicles may experience the ABS light on with DTC C0226, C0236, C0246 and C0256 stored current in the ABS system. Use a Picoscope to monitor the ground to the skid control ECU with the engine running and headlights on, then with the headlights off.

Information courtesy of Mitchell 1

Mike Mavrigian

Dec. 5, 2022

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Some 2014-2020 Toyota 4Runner vehicles may experience the ABS light on with DTC C0226, C0236, C0246 and C0256 stored current in the ABS system. Use a picoscope to monitor the ground to the skid control ECU with the engine running and headlights on, then with the headlights off.

Example with headlights off, with aftermarket bulbs. Note the difference in the ground circuit.
|Photo Credit: Mitchell 1

If the ground circuit voltage fluctuates with the headlights on compared to off, inspect the headlight bulbs for any aftermarket parts such as LED or HID bulbs. If aftermarket bulbs are found, perform the same test with factory original bulbs.

Inspect the aftermarket LED or HID headlight bulbs.
|Photo Credit: Mitchell 1

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

Mike Mavrigian

Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.